Posted by Alia on Thursday, September 27, 2007 at 7:39pm.
My daughter brought home this question:
How does knowing 28=302 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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