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MathFoundation · 8 min2.OA.B.2
Quick Facts to 20
When adding and subtracting become fast and easy, the rest of math feels lighter.
The idea
Knowing your facts within 20 by memory frees your brain to solve bigger problems. Use doubles (7 + 7) and making ten (8 + 2) to help.
Fact 1 of 10
3 + 15
Work all the way through to finish. 8 of 10 right and it’s hers.