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Fast Addition Reverse
Just like Fast Addition, but does the math facts in reverse. Research suggests that learning 9s, then 8s, then 7s, and so on may be more efficient than learning 1s, then 2s, then 3s, and so on. The reason is that you'll reinforce learning of the hardest materials from start until end.
This topic aligns to the following state standards
Grade 1: Num 2. Solves basic addition facts using concrete objects and thinking strategies, such as count on, count back, doubles, doubles plus one, and make ten.
Grade 2: Num 1. Recalls (from memory) the addition facts and corresponding subtraction facts.
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