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Draw one line on a minus sign and it turns into a plus.

Draw one line on a minus sign and it turns into a plus.

The minus sign is just one flat line. Add a line going up and down, and suddenly it becomes a plus sign!

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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.