Question

8. Higher Order Thinking Abby says that

5 2/5-2 1/2=2 9/10. Explain how to use a
number line and counting on to check
Abby's solution.

Answer 1

Answer: One way to check Abby's solution using a number line and counting on is as follows:

Start at 5 2/5 on the number line.

Subtract 2 1/2 by counting left 2 and a half units.

Check if the result is 2 9/10.

If the result of the subtraction is 2 9/10, then Abby's solution is correct. If not, then the solution is incorrect and needs to be re-evaluated.

Using this method, we can visually see the subtraction and verify the result.

Explanation: