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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.

Have 4 cookies and eat all 4? Now you have 0. Taking the whole amount away leaves you with nothing.

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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. Subtraction is the opposite of addition — it undoes it. Subtraction is the opposite of addition — it undoes it. You can check subtraction by adding the answer back. You can check subtraction by adding the answer back.