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Jacob Heyn

easy Multiplication by 11 - 0 views

http://mathtricks.org/multiplication-tricks/multiplication-tricks-multiplying-by-11/

started by Jacob Heyn on 23 Sep 11 no follow-up yet
Jacob Heyn

More Quick Multiplications - 1 views

http://www.mathsisfun.com/multiplication-tips-tricks.html

started by Jacob Heyn on 23 Sep 11 no follow-up yet
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