Unit 1 Measurement
1. In life, the measurement of shorter items can be made in (millimeters, centimeters, decimeters); the measurement of longer objects is commonly used in (meters); and the measurement of longer distances is usually made in (kilometers), and kilometers are also called (kilometers).
2, the length of 1 centimeter has (10) cells, the length of each cell (equal), are (1) mm.
3. The thickness of a 1 cent coin, ruler, magnetic card, small button, and key is about 1 millimeter.
4. When calculating length, only the same units of length can be added or subtracted.
Tips: when converting length units, the large units into small units on the end of the number to add 0 (the relationship equation has a few 0, add a few 0); the small units into large units on the end of the number to remove the 0 (the relationship equation has a few 0, remove a few 0).
5, length units of the relational equation are: ( each two adjacent units of length between the rate of 10)
① rate of 10: 1 meter = 10 decimeters, 1 decimeter = 10 centimeters, 1 centimeter = 10 millimeters,
10 decimeters = 1 meter, 10 centimeters = 1 decimeter, 10 millimeters = 1 centimeter,
② rate of 100: 1 meter = 100 centimeters, 1 decimeter = 100 millimeters, 100 centimeters = 1 meter, 100 millimeters = 1 decimeter
③ The rate of progression is 1000:1 kilometer = 1,000 meters, 1 kilometer = = 1,000 meters, 1000 meters = 1 kilometer, 1000 meters = 1 kilometer
6. When we express how heavy an object is, we usually use (unit of mass). In life, weighing the mass of lighter items, you can use (grams) as a unit; weighing the mass of general items, commonly used (kilograms) as a unit; measure the mass of heavier or bulk items, usually use (tons) as a unit.
Tips: in the "tons" and "kilograms" in the conversion, the tons converted to kilograms, is at the end of the number plus 3 0;
The kilograms converted to tons, is at the end of the number to remove the 3 0.
7
1 ton = 1000 kg 1 kg = 1000 grams 1000 kg = 1 ton 1000 grams = 1 kilo
2. Math problems for 3rd grade
Math Application Problems for 3rd Grade Elementary School (100 questions) 1. There are 4 baskets of apples in the store, each with 55 kilograms, and they have already been sold 135 kilograms, so how many kilograms of apples are left? kilograms of apples?2. There are 24 people in the art group, and the number of people in the sports group is 4 times the number of people in the art group, how many people are in the two groups***?3. Each box of chalk is 1 yuan and 34 cents, and each bottle of ink is 60 cents and 2 cents, and the school bought 6 boxes of chalk and 5 bottles of ink, how much money did it cost***?4. There are 9 basketballs, and the number of footballs is 8 times that of the basketballs, how many footballs are there?5. There are 72 footballs, and 9 basketballs, and how many times that of footballs is that of basketballs?6. There are 9 footballs, and 9 basketballs. How many times the number of basketballs?6. There are 72 soccer balls, exactly 8 times the number of basketballs, how many basketballs?7. The school bought 6 boxes of books, 50 books per box, divided equally among 4 grades, how many books per grade?8. On one side of a 3-kilometer-long highway, a tree is planted every 5 meters, and how many segments are there to be divided into?9. Ming has to walk 200 meters from home to school, and if he walks back and forth for 2 trips ** how many meters?10. The store has to pay for the school to go back and forth. *How many meters are there? 10. There are 19 yellow balloons in the store, 7 fewer red balloons than yellow balloons, 2 times as many flower balloons as red balloons, how many flower balloons are there? 11. The students did the exercises, Xiaohua did 75, Xiaoming did 85, Xiaoqing did 30 less than the total number of Xiaohua and Xiaoming, how many did Xiaoqing do? 12. There are 14 poplars in the school, the number of poplars is twice that of pines, there are 4 more willows than pines, how many more willows than pines, how many more trees are there than pines? How many willow trees are there? 13. There are 46 students in the class of grade 3(1), 21 of them are girls, how many more boys than girls? 14. There are 7 big monkeys in the park, and the number of small monkeys is 9 more than the number of big monkeys, how many monkeys does the park have in one ****? 15. A has 140 yuan, and the number of A's money is twice as many as that of B's, how many yuan does A and B **** have? 16. A train goes from A to B in 5:00 a.m., at the scheduled hourly rate, and it takes about 30 hours. 16. A train travels from A to B at 5 a.m. and travels 120 kilometers per hour according to the original plan to reach B at 3 p.m., but the actual arrival time is 5 p.m. sharp, 2 hours late.
How many kilometers per hour did the train actually travel? (15-5)*120=1200 1200/(10+2)=10017. A car drives from A to B at 8 a.m. and travels 60 km per hour according to the original plan to reach B at 4 p.m. But it actually arrives 2 hours late. However, it actually arrives 2 hours late. How many kilometers per hour does the car actually travel? (16-8)*60=480 480/(8+2)=4818 . Xiaoning, Xiaohong and Xiaojia went to buy pencils. Xiaoning bought 7 pencils, Xiaohong bought 5 pencils and Xiaojia didn't buy any.
When they got home, the three of them divided the pencils equally. Xiao Jia took out 80 cents, how much money should Xiao Jia give to Ning? How much money should be given to Xiaohong? (7+5)/3=4 8/4=2 2*(7-4)=6 8-6=219.Three best friends went to buy drinks, Xiaoliang bought 5 bottles, Xiaohua bought 4 bottles, and Yangyang didn't buy any. When they arrived home, the three of them finished the drinks on average. Yangyang took out 6 yuan, how much should he give to Xiaoliang? How much should he give to Xiaohua? (5+4)/3=3 6/3=2 2*(5-3)=4 6-4=220. Pouring milk into an empty bottle from a cup, if 2 cups of milk are poured in, the bottle*** with it weighs 450 grams; if 5 cups of milk are poured in, the bottle*** with it weighs 750 grams.
How many grams do a cup of milk and an empty bottle each weigh? (750-450)/3=100 450-(2*100)=25021.(1) What is the product of two factors of 7 and 12? (2) What is 3 times 250? 22. A tiger weighs 180 kg and a bear weighs twice as much as the tiger. 23. A fruit store brings in 20 boxes of pears at 25 kg each. How many kilograms are left? 24. Mr. Wang bought a volleyball for 40 yuan, and a basketball for three times as much as the volleyball.
How many yuan did Mr. Wang use to buy the ball? 25.There are 36 students in the school art group I***, of which there are 27 female students. How many times as many female students as male students?26. The students collected tree seeds.
15 kg have been collected, how many more kilograms, the total weight of the tree seeds is exactly 3 times the original?27. A number multiplied by 10, the number obtained is 72 more than the original number. what is the original number?28. The price of a bicycle is 182 yuan, the price of a motorcycle is 700 yuan more than 10 times the price of a bicycle.
What is the price of a motorcycle in dollars? How much more expensive is a motorcycle than a bicycle?29.(1) What is the product of the two smallest two-digit numbers? (2) What is the product of the largest two-digit number and the smallest two-digit number?30.A volleyball tournament was played by 32 teams with 12 athletes each. How many athletes are there in a ***? 31.The toy production group was making 40 toys a day, and now it is making 10 times as many toys a day.
How many more toys are made per day now than before?32. The product of multiplying a three-digit number by 6 is equal to the product of multiplying 41 by 18. What is this three-digit number?33. There are 111 students in three third-grade classes of one ****.
There are 35 students in class I. The number of students in classes II and III is equal. How many students are there in each of the second and third classes?34.(1) What is the product of the two largest two-digit numbers? (2) Multiplying two-digit numbers by two-digit numbers, how many digits is the product likely to be?35. The school bought 25 sets of large sweatshirts and 45 sets of small sweatshirts.
The large ones cost $57 each and the small ones cost $52 each. (1) How much is payable for each of the two types of sportswear? (2) How much does a **** pay?36. The school bought some exercise books and distributed them to 15 classes, each class 164 books, leaving 420 books.
How many exercise books did the school buy?37. Can you calculate the score of the following questions without writing the vertical equation?11*22 12*33 14*55 15*6638. How many eggs were laid in the two months a***?39. What is the product of two factors 63 and 4? What is the product when the factor 4 is enlarged by 10 times and 100 times respectively?40. A factory uses 3 cars to transport coal. 9750 kg of coal were transported in one ****, how many kg were transported in each car on average?41. 500 kg of peaches were transported by Limin Fruit Shop, 13 baskets were sold, on average, 25 kg in each basket, how many kilograms of peaches were left?42. 1440 people in a county attend the Television University.
One TV set for every 8 people. How many sets are missing? 43. The school bought 4 soccer balls for 220 yuan.
A basketball costs 8 yuan more than a soccer ball. How much does it cost to buy 4 basketballs?44. A grain processing plant has milled a batch of rice. It has filled 96 bags of 75 kilograms each, leaving 2700 kilograms unbagged.
This batch of rice is evenly divided into two shipments, a *** shipped how many kilograms?45. Daxing forest last year planted 386 pine trees, planted poplar trees is three times the pine trees. How many poplar trees were planted?46. The fish pond in the park is stocked with 290 red goldfish, and the stocked flower goldfish are about 4 times as many as the red goldfish.
About how many flower goldfish were stocked?47. A grain store sold 430 kg, 380 kg, and 407 kg of rice in 3 days. this store 3.
3. Urgent
3rd (upper) Grade Math Application Problems 1. There are 15 baskets of apples and 10 baskets of pears in the store.
The number of baskets of bananas is 4 less than the total number of apples and pears. how many baskets of bananas are there?2. There are 24 willow trees and 18 acacia trees in the schoolyard. The number of willow trees is 6 more than the total number of poplar trees and acacia trees. How many willow trees are there?3. Xiaohua has 12 stamps, Xiaoming has 15 stamps, and Xiaolin has twice the total number of stamps of Xiaohua and Xiaoming.
How many stamps does Xiaolin have?4. There are 36 story books and 21 science and technology books in the book corner of the third grade class. There are 14 more books of these two kinds than there are comic books.
How many comic books are there?5. The school bought 12 bottles of red ink, and the black ink bought was 3 bottles less than the red ink, and the blue ink bought was twice as much as the black ink. There are 20 apples, 5 fewer pears than apples, and 2 more oranges than pears.
How many oranges are there?7. On the Fourth of July, the students made 30 yellow wreaths, 12 fewer green wreaths than yellow wreaths, and 54 red wreaths. How many times as many red wreaths as green wreaths?8. There are 35 people in the school chorus group, and there are 7 more people in the dance group than in the chorus group.
How many people are there in the two groups?9. There are 12 people playing basketball on the playground, and there are 3 fewer people playing soccer than playing basketball. How many people are there playing basketball and soccer?10. There are 5 tigers in the zoo, and there are 3 times as many deer as there are tigers. (1) How many more deer than tigers? (2) How many deer and tigers are there in a ****?11. There are 45 students in a class of three years, of which 26 are girls. How many fewer boys than girls are there?12. The ages of Xiaohong and her brother add up to 20 years old.
The older brother is 12 years old. How many years older is the older brother than Xiaohong?13. There are 8 big monkeys and 15 small monkeys in the zoo. 16 fewer peacocks than monkeys. How many peacocks are there?14. My sister has 9 science and technology books and 23 story books.
How many books does the sister have?15. There are 8 public **** cars and 5 big trucks in the parking lot. There are 8 more small cars than the total number of public **** cars and big trucks.
How many small cars are there?16. A shipment of bicycles arrived at the store. On the first day, 10 were sold in the morning, 12 in the afternoon, and 17 on the second day. How many fewer were sold on the second day than on the first day?18. A basket of pears weighed 25 kg, a basket of apples was 5 kg lighter than the pears, and a basket of bananas weighed 10 kg more than the apples. How many kg did a basket of bananas weigh?19. The kindergarten bought 15 boxes of pencils. 3 more boxes of crayons were bought than pencils, and 2 times more watercolor pencils were bought than crayons.
How many boxes of watercolors did you buy?21. The students are doing group exercises. There are 6 rows of 8 girls and 32 boys.
How many more girls are there than boys?22. The rabbit farm has 24 gray rabbits and 32 black rabbits. How many more white rabbits are there than black rabbits?23. The students went to visit the exhibition.
There are 48 students in the first grade. 16 more students are in the second grade than in the first grade and 20 fewer than in the third grade. How many people are there in the third grade?24. The school bought 3 packages of chalk, 12 boxes in each package, and divided them evenly among 9 classes, how many boxes were divided among each class?25. A basket can hold 5 kilograms of fruit.
Now there are 25 kilograms of grapes and 30 kilograms of bananas, how many baskets are needed?26, the third grade has 85 pioneers, the fourth grade is 27 more than the third grade, how many pioneers in the two grades a ****?27, there are 16 sheep on the hillside, 4 more than the goats, how many sheep a ****?28, Xiaohua and Xiaoming shuttlecock, Xiaohua kicked 23 times, Xiaoming kicked is Xiaohua and Xiaoming kicked the shuttlecock, Xiaohua kicked it 23 times, Xiaoming kicked it twice as much as Xiaohua, how many times did the two people kick it in one ***? 29、Li Auntie raised 7 roosters, and the hens she raised were 4 times as many as the roosters, how many more hens were there than the roosters?30、The store had a batch of washing machines, and the remaining ones were 3 times as many as the ones that had been sold after selling 8 of them. How many washing machines were there?31, Willow and poplar trees have 46 trees in one ****, and poplar trees have 18 trees, how many fewer poplar trees than willow trees?32, There are 56 pages in a book, and Xiao Ming has read 29 pages.
If you read 9 pages a day, how many days do you need to read the rest?33, Master Wang plans to process 50 machine parts and has worked for 6 hours, processing 7 per hour. How many more are not finished?34, a car with 23 passengers, 4 people in the Victory Street off, and on the spicy some people, this time there are 28 passengers on the car, up how many people?35, the cafeteria bought 3 bags of rice, each bag of 25 kg, ate some of them, there are still 30 kilograms left.
How many kilograms were eaten? 36, the school science and technology team has 18 people, the photography team has 9 people, the number of chess team is twice the number of science and technology team. How many times as many people are in the chess team as in the photography team?37. There are 8 basketballs and 20 exercise balls in the sports room.
The total number of basketballs and soccer balls is 5 less than the number of badminton balls. How many soccer balls are there?38. Xiao Ming goes to school and takes 26 minutes to ride his bike to and from school.
If you ride your bike when you go and walk when you come back, it will take 40 minutes. How many minutes did it take to come back on foot?39. There are some colored chalks.
There are 6 more branches of yellow chalk than green chalk and 8 more branches of red chalk than yellow chalk. There are exactly twice as many red chalks as green chalks.
How many pieces of green chalk, red chalk, and yellow chalk are there? 40. There are 4 cranes, 3 times as many geese as cranes, and 15 ducks in a lake. How many cranes, geese and ducks are there in a ****?41. There are two baskets of oranges, the first weighs 26 kilograms and the second weighs 18 kilograms.
To make the two baskets of oranges weigh the same, how many kilograms of oranges need to be taken out of the first basket and put into the second basket?42. 80 goats are raised in a livestock farm, and 110 milk goats are raised. The number of sheep raised is 120 more than the total number of goats and milk goats.
? (Ask questions that use two-step calculations and then answer them.) 43、There are 2 bookshelves, , 40 books on each shelf, how many books in a ****? (Add a condition, and then answer out.)
44, the school to reward the three good students, bought 8 boxes of fountain pens, each box of 12, 6 yuan per branch. How many dollars were used in one ****? (Answer in two ways.)
45, a car 3 hours to travel 120 kilometers. According to this calculation, how many kilometers in 5 hours? (Make a step-by-step equation and then a combined equation.)
Third grade easy to practice (3) I. Fill in the blanks. 1, fill in the ( ) with the appropriate unit A bag of cookies weighs 100 ( ) An elephant weighs 6 ( ) A language workbook weighs about 75 ( ) A whale weighs about 50 ( ) 2, 9 tons of 500 kilograms = ( ) kilograms 1 ton - 400 kilograms = ( ) kilograms 2 tons of 200 kilograms = ( ) kilograms 4,300 kilograms = ( ) ton ( ) kilograms 3, The car travels 1268 meters per minute and can travel about ( ) meters in 5 minutes.
4. 8 times 40 is ( ) and 40 is ( ) times 8. 5. One factor is 24 and the other is 4. The product is ( ). 6. 50*4*0*14+58 is equal to ( ).
7. 383+384+385+386+387=( )*( )=( ) 2. Multiple Choice Questions 1. Estimate without calculation.
4. elementary school new humanistic version of math in the first three grades are what knowledge
Unit 1 1. moon landing 2. shapes made of squares 3. subtraction tower Unit 2 1. division of whole tens and hundreds 2. multiplication in the big box store 3. two-digit number is divided by a single-digit number 4. multiply the whole tens and hundreds 5. multiply by a single-digit number 6. three-digit number is divided by a single-digit number 7. divide by a single-digit number 8. Exchanging Unit 3 1. dollars, cents, and angles - expressed as decimals 2. kilograms, grams - expressed as decimals 3. kilometers, meters - expressed as decimals 4. meters, centimeters -represented as decimals5. units of length6. years, months, daysUnit 4 1. square meters2. rectangles and rectangular areas3. areas4. trianglesUnit 5 1. multiplying, multiplying, dividing2. the light market3. let's get to know the shapes4. how big they are5 Math Square - -Counting Apples6.Math Square - Segmenting7.Problem Solving - Welcoming the New Year8.Math Square - Putting Away Apples9.Fatty's Home10. Counting triangles.
5. Primary school third grade math story book
Third grade math fun story (a)
Bear's mother is sick, in order to be able to earn money for his mother's treatment, the bear got up at dawn every day to go down to the river to fish, catching the morning market to the vegetable market to sell fish.
One day, the bear just set up a fish stall, the fox, black dog and the old wolf came. Bear saw a customer visit, hastily greeted: "buy fish, I just caught this fish, fresh it!" The fox fiddled with the fish and asked, "How much is a kilogram of such fresh fish?" The bear was all smiles, "Cheap, four dollars a kilogram." The old wolf shook his head, "I'm old, my teeth don't work anymore, I just want to buy some fish bodies." The bear blushed, "I'll sell you the body of the fish, who will I sell the head and tail to? "The fox flicked his tail and said, "Yes, no one wants to buy the rest of this, but Uncle Wolf has bad teeth and can only eat some fish. This way, I and the black dog teeth good, we a buy fish head, a buy fish tail, not both help the wolf uncle, but also help you bear old brother?" Bear heard straight clapping, but still a little hesitant: "good good, but how to set the price?" Fox eyes, replied: "The body of the fish 2 yuan 1 kilogram, fish head, fish tail 1 yuan 1 kilogram, not exactly 4 yuan 1 kilogram?" The bear drew on the ground with a small stick, then slapped his thigh: "OK, let's do it!" Four people work together, not long after the head, tail, fish identity, the bear a scale, the body of the fish 35 kilograms of 70 yuan; fish head 15 kilograms of 15 yuan, fish tail 10 kilograms of 10 yuan. The old wolf, the fox and the black dog carried the fish, flew to the forest, the fish head fish body fish tail matching, re-divided equally,......
Bear on the way home, while walking and thinking: I 60 kg of fish according to the 4 yuan 1 kg should be sold for 240 yuan, but how to now only 95 yuan ... ... how the bear can not make sense of it.
Do you know what this is all about?
6. What to study in the first semester of the third grade of elementary school mathematics
A. The content of the textbook includes some of the following: hours, minutes and seconds, addition and subtraction within 10,000 written arithmetic, the understanding of times, multi-digit multiplication by a single-digit number, the initial recognition of fractions, rectangles and squares, millimeters, decimeters, kilometers and tons of knowledge, mathematical angle - *** ( overlapping problems) and mathematical practical activities (), and mathematical activities (). Overlapping Problems) and Practical Math Activities (Number Coding).
II. Specific instructions:
(a) Knowledge and skills
1. They can correctly add and subtract three-digit numbers, and can do estimation and checking accordingly.
2, can orally multiply one-digit numbers by ten or one hundred; can multiply one-digit numbers by two or three digits, and can estimate.
3, the initial recognition of simple fractions (denominator less than 10), can read, write fractions and know the name of the ministries, the initial recognition of the size of fractions, can calculate the simple addition and subtraction of fractions with the same denominator, and can solve simple practical problems related to fractions.
4, can distinguish and identify quadrilaterals, grasp the characteristics of rectangles and squares, can draw rectangles and squares on the grid paper; know the meaning of perimeter, can calculate the perimeter of rectangles and squares; can estimate the length of some objects, and can be measured.
5, know the length units of millimeters, decimeters and kilometers, the initial establishment of 1 millimeter, 1 decimeter and 1 kilometer length concept, know that 1 centimeter = 10 millimeters, 1 decimeter = 10 cm, 1 kilometer = 1,000 meters; know the unit of mass, the initial establishment of the concept of mass of 1 ton, know that 1 ton = 1,000 kilograms, will carry out a simple conversion, and can choose the appropriate unit; know the unit of time seconds, the initial establishment of minutes, seconds, and can calculate the perimeter of the square, square; can estimate the length of some objects and can be measured. unit of time seconds, the initial establishment of minutes, seconds of time concept, know 1 minute = 60 seconds, will carry out some simple calculations about time.
6, to understand the meaning of "times", master "for a number is another number of times" and "for a number of times" of the actual problem.
7. Students can solve simple practical problems with the help of visualization, using *** thinking method.
(B) mathematical thinking
1, experience the intrinsic connection between mathematical knowledge, feel the connection between mathematics and life, the initial understanding of *** thinking, and gradually form the concept of space.
2, combined with the actual problems in life, flexible use of mathematical knowledge to solve problems in life.
3. Combined with specific situations, through visualization, preliminary understanding of the meaning of fractions, and appreciate the need to learn fractions.
(3) Problem Solving
1. Experiencing the process of discovering and proposing problems and solving problems from life, experiencing the close connection between mathematics and daily life, and feeling the role of mathematics in daily life.
2. Understand that there can be different solutions to the same problem.
3. To have the experience of cooperating with classmates to solve problems.
4. Begin to learn how to express the general process and result of solving problems.
(4) Emotions and attitudes
1. With the encouragement and help of others, they are curious about certain things related to mathematics around them, and can actively participate in vivid and visual teaching activities.
2. With the encouragement and help of others, they can overcome some of the difficulties encountered in mathematical activities, have successful experiences, and have confidence in learning mathematics.
3. They can experience the process of learning mathematics through observation, manipulation and induction, and feel the rationality of the mathematical thinking process.
4. Under the guidance of others, they are able to find mistakes in math activities and correct them in time.
5. To experience the fun of learning mathematics, to increase interest in learning mathematics, and to build up confidence in learning mathematics.
6. To develop good habits of serious homework and neat writing.
7.