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.
$77 + \boxed{3} = 80$

how much more does lou need to add on?
$77 + 48$
$= 77 + (3 + \boxed{?})$

Explanation:

Step1: Analyze the addition breakdown

We know that \(48\) can be broken down into \(3 +?\) because we already used \(3\) to get from \(77\) to \(80\). So we need to find the number that when added to \(3\) gives \(48\).

Step2: Calculate the missing number

Let the missing number be \(x\). We have the equation \(3 + x = 48\). To find \(x\), we subtract \(3\) from \(48\): \(x = 48 - 3\).
Calculating \(48 - 3\), we get \(45\).

Answer:

\(45\)