3rd grade math
posted by Alia .
My daughter brought home this question:
How does knowing 28=302 help you find 13+28?
Any ideas?

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.

Yes, it is a matter of grouping:
13+ 28= (11+2)+28= 11 + (2+28)= 11+30 
length in feet and inches
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