Posted by **Kelly** on Tuesday, January 4, 2011 at 6:59pm.

My son's math homework asks him to find each product by factoring the tens. 6 x 2, 6 x 20 and 60 x 20. There is no explaination in the book..can you help?

- Math -
**Marth**, Tuesday, January 4, 2011 at 7:15pm
Factoring the tens is a technique for mental multiplication which relies on the fact that 10*n, for any real number n, is easy to compute.

6*2 = 12 is a memory value.

6*20 = 6*2*10 = 12*10 = 120

60*20 = 6*10*2*10 = 12*10*10 = 1200

- Math -
**Anonymous**, Saturday, February 16, 2013 at 9:23am
60-20=20+___

- Math -
**Anonymous**, Friday, October 3, 2014 at 8:05am
40

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