1.OA.C.6 – Add within 20
Add within 20
1.OA.C.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).
Adding By 1
Practice Adding by 1
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Adding By 9
Practice Adding by 9
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Adding By 2
Practice Adding by 2
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Adding By 8
Practice Adding by 8
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Adding By 3
Practice Adding by 3
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Adding By 7
Practice Adding by 7
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Adding By 4
Practice Adding by 4
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Adding By 5
Practice Adding by 5
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Adding By 6
Practice Adding by 6
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