To find: The error in finding the sum of two numbers using the number line and correcting the error.
Answer to Problem 13E
Explanation of Solution
Given Information: The number line showing an incorrect method to find the sum of
Method:
- To add a positive number, move to the right on the number line by a length equal to the number.
- To add a negative number, move to the left on the number line by a length equal to the number.
First locate
Therefore, the sum is
In the given solution, instead of moving a distance of
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