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# Subtraction to 20 Operations and Algebraic Thinking (Answer Key) 52 Task Cards

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PDF (Acrobat) Document File

2 MB|33 pages
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Operations & Algebraic Thinking Subtract within 20
2 sets of 26 Task Cards or use as math journal entries
Missing Number
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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Total Pages
33 pages
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Teaching Duration
N/A
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