Question

to make $77 + 48$ easier to solve, lou decides to first add on from 77 to get to the next ten.

add on to get to 80.
$77 + \boxed{?} = 80$

Explanation:

Step1: Define the equation

We have the equation \( 77 + x = 80 \), where \( x \) is the number we need to find.

Step2: Solve for \( x \)

To find \( x \), we subtract 77 from both sides of the equation. So, \( x = 80 - 77 \).
Calculating \( 80 - 77 \), we get \( x = 3 \).

Answer:

3