$56 \times 57 =$ ___

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Solution

56 -4
57 -3
______
53 / 12

1. Both the numbers are closer to 60 (so take base = 60).
2. 56 is 4 less than 60 and 57 is 3 less than 60.
3. $(- 4) \times (- 3) = 12$
4. 56 + (-3) OR 57 + (-4) = 53
5. Final answer = $53 \times 60 + 12 = 3192$

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