Halfway Between 18 and 90

When you ask "What number is halfway between 18 and 90?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=90.

Halfway Between Line

To find the number halfway between 18 and 90, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 18 and 90 into our formula, we get:

(18 + 90)/2 = 54

Thus, the number halfway between 18 and 90 is 54.

To check that our answer is correct, we subtract 18 from 54 and subtract 54 from 90 and compare the two numbers:

54 - 18 = 36
90 - 54 = 36

As you can see, the halfway number is 36 higher than 18 and 36 lower than 90. Therefore, our halfway between answer of 54 above is correct.

Halfway Between
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Halfway Between 18 and 91
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