Which numbers can best be used to estimate 3,872 + 5,109?

Choose exactly two answers that are correct.

A.

3,000

B.

4,000

C.

5,000

D.

6,000

3872 + 5109

estimate:

3872 rounds to 4000 <==

5109 rounds to 5000 <==

B. because if you round like you would with a decimal 3,872 becomes 4,000, you rounded up. then 5,109 would also be 4,000 because you round downwards. All because of the numbers after the comma