Estimate using mental math and then calculate the exact sum or difference. Enter the exact sum or difference in the answer field.

4.817 + 9.099 + 17.008 =

484.603 − 48.198 =

1 answer

Estimate:
4.817 is very close to 5.0
9.099 is very close to 9.0
17.008 is SUPER close to 17.0
So ... 5 + 9 + 17 = what?

You can do the same for the second set of numbers.

Then simply do the addition (for the first) and subtracion (for the second).