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Trick: Multiplying double digit numbers

December 20, 2009 Living, Tips and Tricks 1 Comment

To keep my brain limber, I sometimes think of two random double-digit numbers and try to multiply them by each other as fast as I can. Weird, I know. Oh well.

  • First, multiply 1 x 4 and bring it straight down (4)
  • Then, cross multiply (3×4 and 1×2) and add each of them up (12 + 2), save whatever is in the 10’s place (1), and bring what is in the 1’s place down (4)
  • Lastly, Multiply straight up and down (3×2) and add what was leftover (1)

That’s it.

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