Addition and Subtraction with regrouping

double digit

转盘内容（10 个选项）

45-26
29+46
43-26
76+17
24-15
23+37
42-25
27+26
76-28
34+36

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Addition and Subtraction

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Subtracting 3 numbers w/out regrouping

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Subtracting 3 numbers w/ regrouping

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Let's add and subtract!

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-OW 1 ORAL EXAM-

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Câu hỏi phản xạ + kiên thức đơn giản

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