Okay, we can round each number to the nearest whole.
37.2 + 2583
Round 37.2
If
the number after the decimal point is 5 or more, we round up, but if it’s 4 or
less, we round down.
The number is 2 so we round down to 37.
Now we add 37 + 2583, which equals 2620.
18.256 - 5.71
Again, look at the numbers after the decimal point.
For 18, it's 2, so we round down to 18. For 5, it's 7 so we round up to 6.
So we have:
18 - 6
Subtract:
12
-9.916 + 12.4
Again, look at the numbers after the decimal point.
For -9, it's 9, so we round up to -10, for 12, it's 4, so we round down to 12.
So we have:
-9 + 12
Add:
3
