Question

which number line model represents the expression -4.5 + (-3.5)? choose 1 answer:

Explanation:

Step1: Simplify the expression

$-4.5+(-3.5)=-4.5 - 3.5=-8$
We start at 0 on the number - line. First, we move 4.5 units to the left to represent - 4.5. Then, since we are adding - 3.5, we move another 3.5 units to the left.

Step2: Analyze number - line models

In option A, we start at 0, move 4.5 units down (left on a vertical number - line) to represent - 4.5 and then move another 3.5 units down to represent adding - 3.5, which is correct.
In option B, the second arrow is in the wrong direction. We should be moving further to the left (down on a vertical number - line) when adding a negative number, but in option B, the second arrow moves to the right.
In option C, the number - line is incomplete and does not show the correct movements for the given expression.

Answer:

A.