A teacher writes this subtraction problem on the board for the class to solve.

Question

7−2=___
Part A
Which number line shows how to count back to find the difference?

(1 point)
Responses

A number line goes from 0 to 10. Arrows point from 9 to 8 and from 8 to 7.
Image with alt text: A number line goes from 0 to 10. Arrows point from 9 to 8 and from 8 to 7.

A number line goes from 0 to 10. Arrows point from 7 to 6 and from 6 to 5.
Image with alt text: A number line goes from 0 to 10. Arrows point from 7 to 6 and from 6 to 5.

A number line goes from 0 to 10. Arrows point from 7 to 6, from 6 to 5, from 5 to 4, from 4 to 3, and from 3 to 2.
Image with alt text: A number line goes from 0 to 10. Arrows point from 7 to 6, from 6 to 5, from 5 to 4, from 4 to 3, and from 3 to 2.

A number line goes from 0 to 10. Arrows point from 4 to 3 and from 3 to 2.
Image with alt text: A number line goes from 0 to 10. Arrows point from 4 to 3 and from 3 to 2.
Question 2
Part B
What is the difference?

(1 point)
Responses

7−2=3
7 - 2 = 3

7−2=4
7 - 2 = 4

7−2=5
7 - 2 = 5

7−2=6

Answer 1

For Part A, the correct number line that shows how to count back to find the difference for the problem \( 7 - 2 \) is:

A number line goes from 0 to 10. Arrows point from 7 to 6, from 6 to 5, from 5 to 4, from 4 to 3, and from 3 to 2. This shows the counting down from 7 to 5 (which is 2 subtracted).

For Part B, the difference of \( 7 - 2 \) is:

7 - 2 = 5

So the correct responses are:

• Part A: The third option (the one showing arrows from 7 down).
• Part B: \( 7 - 2 = 5 \).