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Subtract within 20
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Learn it To subtract past 10, go back to 10 first, then take away the rest.
Example: $14 - 6$
- 14 − 4 = 10 (back to 10).
- We still need to take away 2 more (because 4 + 2 = 6).
- $10 - 2 = $ 8.
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