Trachtenberg system of multiplication by 11 and 12

  • The last digit of the multiplicand (rightmost digit) is put down as rightmost digit.
  • Each successive digit is added to its neighbor at the right.
  • The first digit (leftmost digit) of the multiplicand becomes the leftmost digit of the answer. Carry of previous addition will be added to this leftmost digit.
first rule
second rule
Third rule
rightmost digit addition
neighbor adding to number/digit
leftmost digit addition

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Jyothi

Jyothi

www.linkedin.com/in/jyothivs

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