Question

Consider the addition expression 42 + 2(7) on the number line shown. Explain how you would evaluate the expression on the number line.

A. Begin at 14 and move seven units to the right six times

B. Begin at 42 and move two units to the left seven times

C. Begin at 42 and move seven units to the right twice

D. Begin at 42 and move seven units to the left twice

Answer 1

C. Begin at 42 and move seven units to the right twice

Explanation:

Working from left to right, the expression's first term of 42 suggest we want to start at 42 on the number line.

The added term of 2(7) tells us we will be moving farther to the right. The product can be represented by either 2 moves of 7 units each, or 7 moves of 2 units each.

The only description that has the appropriate move in the appropriate direction is that of option C.