Key Idea1 of 3
Match Problem to Strategy
Subtracting 1, 2, or 3? Count back! Numbers close together (like 12-9)? Count up! Know the addition fact? Think addition! Pick what feels fastest.
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Mathematics — Subtraction Strategies
Subtracting 1, 2, or 3? Count back! Numbers close together (like 12-9)? Count up! Know the addition fact? Think addition! Pick what feels fastest.