Add within 20

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2.OA.B.2

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

Adding By 1

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Adding By 9

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Adding By 2

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Adding By 8

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Adding By 3

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Adding By 7

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Adding By 4

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Adding By 5

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Adding By 6

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