Question

Subtracting Integers

Pre-Test Active
1 2
Michael is using a number line to evaluate the expression -8 - 3.

After locating -8 on the number line, which step could Michael complete to evaluate the expression?
Michael could rewrite the expression as -8+3 and move 3 spaces to the right.
O Michael could rewrite the expression as -8+-3 and move 3 spaces to the right.
Michael could rewrite the expression as -8+ 3 and move 3 spaces to the left.
Michael could rewrite the expression as -8+-3 and move 3 spaces to the left.​

Answer 1

Michael could rewrite the expression as -8+-3 and move 3 spaces to the left.​

Explanation:

Answer 2

Michael could rewrite the expression as -8+-3 and move 3 spaces to the left.​

Explanation:

To evaluate the expression, Michael could rewrite the expression as -8+(-3), because that is equivalent to -8-3, both results in -11.

Also, by rewriting the expression, Michael can figure out that he first need to place at the location of -8, and then +(-3) means that has to move three units to the negative side, that is, to the left, that procedure will get him to -11.

Therefore, the right answer is the last one. Other options just don't make sense, because some rewrite the expression as -8+3, which is wrong, or they suggest to move to the right, which is also wrong.