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31

x 7

---

__7

21 (The underscores are for formatting) The 7 should be aligned in a column to the right of 21

217

Or: 31 = 3x10 + 1 ---> 7 x (3x10 + 1) = 7x3x10 + 7x1 = 21x10 + 7 = 210 + 7 = 217

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