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Subtraction is the opposite of addition — it undoes it.

Subtraction is the opposite of addition — it undoes it.

Adding puts things together, and subtracting takes them apart. They are like a pair that work in opposite ways.

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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. You can check subtraction by adding the answer back. You can check subtraction by adding the answer back.