Asked by Anonymous
how to do arrays and expanded algorithms for multiplication example 17x 23 this is for a fourth grader help
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Answered by
MathMate
17*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
For information on expanded algorithm for teachers, see:
http://math-ed.com/NO/NO_2_4_reading.htm
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