What integer represents the midpoint between -9 and 7 on a standard number line? — ACT

What integer represents the midpoint between $-9$ and $7$ on a standard number line?

The midpoint coordinate is

-1

The midpoint of two numbers on a number line is their mathematical average. Adding the coordinates

-9

and

7

gives a sum of

-2

. Dividing this sum by

2

yields the midpoint coordinate of

-1

Identify the coordinates of the two endpoints on the number line.

The endpoints are

-9

and

7

Before calculating the midpoint, we must identify the values of the two points given in the problem.

Find the average of the two coordinates using the midpoint formula

\frac{a + b}{2}

\frac{-9 + 7}{2} = \frac{-2}{2} = -1

The midpoint of any two coordinates on a number line is their arithmetic mean.

Finding the midpoint between two integers on a number line

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