The problem asks which number line model represents the expression $-1\frac{1}{2} + 1\frac{1}{2}$.

1. Problem Description

The problem asks which number line model represents the expression $-1\frac{1}{2} + 1\frac{1}{2}$.

2. Solution Steps

We need to find the number line model that corresponds to the given expression.

The expression $-1\frac{1}{2} + 1\frac{1}{2}$ means we start at 0, move $1\frac{1}{2}$ units to the left (negative direction), and then move $1\frac{1}{2}$ units to the right (positive direction).

$-1\frac{1}{2} + 1\frac{1}{2} = -\frac{3}{2} + \frac{3}{2} = 0$

So, the number line model should start at 0, move to $-1\frac{1}{2}$, and then move back to

0. The arrow should start from 0 and point to $-1\frac{1}{2}$.

The next arrow should start from $-1\frac{1}{2}$ and point to

0.

3. Final Answer

The solution requires to choose a number line but this is not visible on the image. The number line starts at 0, moves to $-1\frac{1}{2}$, then moves to

0.