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You can check subtraction by adding the answer back.

You can check subtraction by adding the answer back.

7 − 3 is 4. To check, add it back: 4 + 3 makes 7 again! Addition and subtraction are helpful partners.

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Subtracting means taking some away to get a smaller number. Subtracting means taking some away to get a smaller number. The minus sign (−) tells you to take away. The minus sign (−) tells you to take away. When you take zero away, the number stays the same. When you take zero away, the number stays the same. If you take a number away from itself, you are left with zero. If you take a number away from itself, you are left with zero. Subtraction is the opposite of addition — it undoes it. Subtraction is the opposite of addition — it undoes it.