1.OA.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 — 4 = 13 — 3 — 1 = 10 — 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 — 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Double Facts within 10

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Model Part-Part Whole

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Make a Number

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Make a Ten

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Double Facts within 20

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Add 1

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Add 2

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Add 3

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Add 4

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Add 5

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Add 6

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Add 7

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Add 8

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Add 9

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Subtract 1

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Subtract 2

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Subtract 3

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Subtract 4

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Subtract 5

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Subtract 6

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Subtract 7

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Subtract 8

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Subtract 9

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