Question

Francine used her computer for 2 1/8 hours Tuesday evening and for 2 1/4 hours on Wednesday evening. Which is the best estimate of the time Francine used her computer on Tuesday and Wednesday evenings?

Answer 1

This would be 2 1/4 + 2 1/8  = 4 3/8 hours

Answer 2

$2 \frac{1}{8} +2 \frac{1}{4} =4 \frac{3}8}$
$\frac{3}{8}$ is less than .5 so you would round down to 4

So my guess since you did not provide the choices is about 4 hours.