Math: 4th grade

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I have problems with expressions..

Susan had 24 stamps. She used some to mail letters..

What expression could I write for that?

Also..
Nancy had 23 books. Her dad bought some books and gave Nancy all but 3 of them.

  • Math: 4th grade -

    1) what about

    24-n where n is the number mailed.
    2)
    23+(b-3) where b is the number of books dad bought.

  • Math: 4th grade -

    MR SPIDER HAS 7 TIMS AS MANY FLIES AS HE DOES BEETLES. ALTOGETHER HE HAS 48. HOW MANY FLIES AND HOE MANY BEETLES DOES MR SPIDER HAVE?

  • Math: 4th grade -

    thank you so much

  • Math: 4th grade -

    1) 23-x
    2)23(x-3)

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