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
7 - 2 = 6
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Answer 1

Part A:

To find the difference in the subtraction problem \(7 - 2\), you would need to count back from 7. The correct number line to show how to count back to find the difference is:

• A number line goes from 0 to 10. Arrows point from 7 to 6 and from 6 to 5.

So the answer is the second option.

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Part B:

The difference for the problem \(7 - 2\) is \(3\).

So the correct response is:

• 7 - 2 = 3

This matches the first option in Part B.