Understanding Subtraction through Addition

Why can addition be used to verify subtraction?

• Because subtraction always results in zero.

• Because subtraction is the reverse of addition.

• Because subtraction and addition are unrelated operations.

• Because addition is easier than subtraction.

In the example of 15 minus 7, what is the result when you add the parts back together?

• 22

• 15

• 8

• 7

What is the sum of the parts in the example of 13 minus 8?

• 21

• 8

• 13

• 5

In the example of 16 minus 9, what is the whole number when the parts are added?

• 7

• 9

• 16

• 25

How can you verify the subtraction of 14 minus 6 using addition?

• By adding 14 and 6

• By adding 6 and 8

• By subtracting 8 from 14

• By subtracting 6 from 14