fact-family/add-sub-within-20/hard · セット 88
6 problems
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日付：
1
Write the fact family for 3, 9, 12:
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2
Write the fact family for 12, 4, 16:
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3
Write the fact family for 2, 2, 4:
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4
Write the fact family for 12, 1, 13:
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5
Write the fact family for 2, 10, 20:
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6
Write the fact family for 9, 1, 10:
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