Question

to make 77 + 48 easier to solve, lou decides to first add on from 77 to get to the next ten.
+ 3 + ?
77 80
add on to get to 80.
77 + 3 = 80
how much more does lou need to add on?
77 + 48
=77 + (3+ ?)

Explanation:

Step1: Analyze the total addition

We know that we need to calculate \(77 + 48\), and we already split \(48\) into \(3+\text{?}\). So we need to find what number 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 \(48\), so \(x = 48- 3\). Calculating \(48 - 3\), we get \(45\).

Answer:

\(45\)