1.NOS.D.9: Recall or quickly derive addition and subtraction facts within 20. a. Use the count on and count back strategies to add and subtract (e.g., 4 + 1, 7 – 2, etc.). b. Use the make ten strategy to add and subtract with combinations of 10 (e.g., 7 + 3, 6 + 4, 10 – 3, 10 – 6, etc.). c. Use the ten more and ten less strategies to add and subtract (including those with a difference of 10). d. Use the doubles to add and subtract (e.g., 6 + 6 = 12, 14 – 7 = 7, etc.)

Recall or quickly derive addition and subtraction facts within 20. a. Use the count on and count back strategies to add and subtract (e.g., 4 + 1, 7 – 2, etc.). b. Use the make ten strategy to add and subtract with combinations of 10 (e.g., 7 + 3, 6 + 4, 10 – 3, 10 – 6, etc.). c. Use the ten more and ten less strategies to add and subtract (including those with a difference of 10). d. Use the doubles to add and subtract (e.g., 6 + 6 = 12, 14 – 7 = 7, etc.)

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