Posted by amanda on Thursday, September 9, 2010 at 4:30pm.
Use compatible numbers to complete this problem. Then estimate the sum.
3,428
+432
_____

3rd grade  Writeacher, Thursday, September 9, 2010 at 5:36pm
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  angela, Thursday, September 9, 2010 at 6:31pm
3860
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