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January 25, 2015

January 25, 2015

Posted by **Anonymous** on Tuesday, November 15, 2011 at 8:19pm.

- math -
**MathMate**, Tuesday, November 15, 2011 at 8:46pm17*23 can be done in the head as 20²-3²=400-9=391.

For information on expanded algorithm for teachers, see:

http://math-ed.com/NO/NO_2_4_reading.htm

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