Operations & Algebraic Thinking Subtract within 20
Answer key included
2 sets of 26 Task Cards or use as math journal entries
Differentiate and Extend your lesson
Subtract within 20, demonstrate fluency for subtraction
within 20. 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).
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