4+8= 12, and write 2 as 1.

2 plus the number of carry 1, the result is 3, write 3.

24+8=32

Extended data

Addition satisfies commutative law and associative law. The unit of addition is 0, that is, adding 0 to any number will get the same number. In addition, the inverse of addition is the inverse number, that is, any number is added to its inverse number to get the unit element 0. For example, the reciprocal of 7 is (-7), so 7+(-7) = 0.

Subtraction satisfies neither the commutative law nor the associative law. For this reason, it is usually helpful to regard subtraction as the sum of the reciprocal of the minuend, that is, a? b=a+(？ B) Yes. When written as addition, all the properties of addition hold.