fact-family/add-sub-within-20/hard · セット 79
6 problems
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日付：
1
Write the fact family for 10, 9, 90:
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2
Write the fact family for 6, 8, 48:
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3
Write the fact family for 11, 4, 44:
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4
Write the fact family for 4, 7, 11:
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5
Write the fact family for 4, 7, 28:
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6
Write the fact family for 3, 17, 20:
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