QuestionLou wants to make $96+56$ easier to solve in his head. He decides to add on from 96 to get to 100 first.
Add on to get to 100 . $$96+\square=100$$

Studdy Solution
Verify the calculation by adding the result back to $96$:
$$96 + 4 = 100$$
The number Lou needs to add to $96$ to reach $100$ is:
$\boxed{4}$