Special Subtraction Rules: Zero and One

Core Concepts

Master the simple but important rules for subtracting zero from a number, subtracting a number from itself, and subtracting one ('one less').

Special Subtraction Rules: Zero and One

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What happens when you subtract zero ($0$) from any number?

The number stays the same. Subtracting zero means taking nothing away.

$$6 - 0 = ?$$

$$6$$

$$9 - 0 = ?$$

$$9$$

What happens when you subtract a number from itself?

The answer is always zero ($0$).

$$5 - 5 = ?$$

$$0$$

$$8 - 8 = ?$$

$$0$$

Subtracting one ($1$) is the same as finding what?

It's the same as finding the number that is 'one less'.

$$7 - 1 = ?$$

$$6$$

$$4 - 1 = ?$$

$$3$$

$$9 - 1 = ?$$

$$8$$

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