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Arithmetic Methods

These are Alternate Arithmetic Methods to the ones usually taught in schools.

Scratch Addition: Quick and easy way to add a column of single digit numbers using the Scratch or Dot Method. http://youtu.be/aobn006_rl0

Multiply by 9 the easy way: multiply single digits by 9, and larger numbers when all the digits are the same, like 88888 x 9

Squaring numbers whose digits are all ones like 11 x 11 or 11111 x 11111, etc. Show your friends!