fact-family/add-sub-within-20/hard · セット 90
6 problems
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日付：
1
Write the fact family for 4, 3, 12:
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2
Write the fact family for 16, 3, 19:
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3
Write the fact family for 10, 9, 90:
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4
Write the fact family for 11, 5, 55:
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5
Write the fact family for 15, 2, 17:
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6
Write the fact family for 10, 5, 50:
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