Posted by **Alia** on Thursday, September 27, 2007 at 7:39pm.

My daughter brought home this question:

How does knowing 28=30-2 help you find 13+28?

Any ideas?

- 3rd grade math -
**Amanda**, Thursday, September 27, 2007 at 7:44pm
Because then you can figure out what 11 more than 30 is. That is easier than trying to add 13 and 28 in your head.

- 3rd grade math -
**bobpursley**, Thursday, September 27, 2007 at 8:57pm
Yes, it is a matter of grouping:

13+ 28= (11+2)+28= 11 + (2+28)= 11+30

- 3rd grade math -
**justin**, Wednesday, February 13, 2013 at 4:59pm
length in feet and inches

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