Question

4 models a and b are shown. which expression best matches each model? move the correct answer to each box. not all answers will be used.
-6 + 4
6 + 4
4 + (-3)
6 + 3 + (-5)
4 + (-5)
model a
model b
expression:
expression:

Explanation:

Step1: Analyze Model A number line

Model A starts at -1, moves right 5 units to 4. This is $-1 + 4$.

Step2: Analyze Model B counters

Model B has 8 positive counters, removes 4 negative counters (equivalent to adding 4). This is $8 + 4$.

Answer:

Model A Expression: $-1 + 4$
Model B Expression: $8 + 4$