Answer
Estimate: $4$
Exact: $4.2971$
Work Step by Step
We need to subtract:
$~~~7.8$
$-\underline{3.5029}$
First, we estimate by rounding:
$~~~8.0$
$-\underline{4.0}$
$~~~4.0$
Next, we find the exact answer:
$~~~7.8000$
$-\underline{3.5029}$
$~~~4.2971$
We see that our estimate and exact answers are fairly similar.
