EXCEL values retain integers, but decimals that are not shown in the calculation formula will also be counted. How can decimals not participate in the calculation?

=int(a 1)+int(a2)

Int means to keep integers and lose decimals.

By the way: the formula of rounding

Round () rounding

Roundup () enters a place unconditionally.

Rounddown () unconditionally discards values after decimal point = int ().