Halfway Between 21 and 315

When you ask "What number is halfway between 21 and 315?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=315.

Halfway Between Line

To find the number halfway between 21 and 315, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 315 into our formula, we get:

(21 + 315)/2 = 168

Thus, the number halfway between 21 and 315 is 168.

To check that our answer is correct, we subtract 21 from 168 and subtract 168 from 315 and compare the two numbers:

168 - 21 = 147
315 - 168 = 147

As you can see, the halfway number is 147 higher than 21 and 147 lower than 315. Therefore, our halfway between answer of 168 above is correct.

Halfway Between
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Halfway Between 21 and 316
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