Life long sharing . . .

Tips for Multiplication 11×11 to 19×19

Posted on: August 11, 2015

Sharing a tip for multiplication 11×11 to 19×19.

The formula is:

1n x 1m = 10 x (1n + m) + (n x m)

E.g.

multiplicationTeen

Resource: http://www.leesharing.com/2015/08/blog-post_57.html

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