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60 x31 x 29 = 53940 You can do this one in your head if you look at it for a moment ! 31 x 29 can be re-written (30+1)(30-1) which is the same as 302 - 1. Multiplying this by 60 gives (2 x 303) - 60, or 54000 - 60 which is 53940.

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16y ago

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