Breaking Apart Numbers to Subtract

What is the first step in breaking apart the number 12 to subtract it from 75?

• Break 12 into 5 and 7

• Break 12 into 10 and 2

• Break 12 into 8 and 4

• Break 12 into 6 and 6

When subtracting 18 from 75, why is 18 broken into 10, 5, and 3?

• Because 18 is an even number

• To make subtraction easier by handling smaller numbers

• Because 18 is a prime number

• To match the number line

In the example of subtracting 17 from 43, why is 7 further broken down into 3 and 4?

• Because 7 is a prime number

• To make subtraction easier by using numbers that match the minuend

• Because 7 is a difficult number to subtract

• To make the number line more accurate

What is the result of subtracting 17 from 43 using the breaking apart method?

• 25

• 28

• 26

• 27

How is the number 8 broken down when subtracting 18 from 56?

• Into 7 and 1

• Into 4 and 4

• Into 5 and 3

• Into 6 and 2