Question

Estimate the sum of 3879 and 5276.

Answer 1

3,879 rounds to 4,000

5,279 round to 5,000

4,000+5,000= 9,000

CHECK YOUR WORK:

 3,878

+5276

------------

9,155 so about 9,000

So about 9,000

Answer 2

   1   1    5276 +  3879 ----------------      9   1  5  5  ------------------     is 9000