3rd grade

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Use compatible numbers to complete this problem. Then estimate the sum.

3,428
+432
_____

  • 3rd grade -

    What numbers are 3428 and 432 fairly close to? Once you come up with those, then you should be able to add in your head and estimate the answer.

    3428 -- fairly close to 3400
    432 -- fairly close to 450

    When you add those two in your mind, you should get 3850.

  • 3rd grade -

    3860

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