3rd grade math

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My daughter brought home this question:
How does knowing 28=30-2 help you find 13+28?
Any ideas?

  • 3rd grade math -

    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 -

    Yes, it is a matter of grouping:

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

  • 3rd grade math -

    length in feet and inches

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