5TH grade math
posted by Alyssa .
estimate each sum or differnce.
7.4 + 3.1+ 9.8
How do I do this?

Is 7.4 closer to 7.0 or 8.0?
Is 3.1 closer to 3.0 or 4.0?
Is 9.8 closer to 9.0 or 10.0?
Once you decide, then add. 
7.0 3.0 10.0

20

19

3.0+9.0+10.0=20.0

11.11

egw

is it 17.5 ms

7.0+3.0+10.0