Subtraction Unit Review

True or false: Subtraction is the OPPOSITE of addition.

• True

• False

True or false: The order of subtraction MATTERS! The smaller number always comes first!

• True

• False

True or false: When we subtract, we always start in the LOWEST place value (the ones place).

• True

• False

True or false: When we subtract, our number is increasing (getting bigger).

• True

• False

What is the first step in subtraction?

• Decide if you need to regroup.

• Start in the ones place.

• Stack your digits.

• Decide which strategy you are going to use.

How do you know if a question requires regrouping?

• If the top number is greater than the bottom number, you need to regroup.

• If the top number is less than the bottom number, you need to regroup.

• If the top number is equal to the bottom number, you need to regroup.

• You always need to regroup when you subtract, no matter what the numbers are!

Does this question require regrouping?

• Yes

• No

Does this question require regrouping?

• Yes

• No

Does this question require regrouping?

• Yes

• No

Does this question require regrouping?

• Yes

• No