Halfway Between 21 and 637

When you ask "What number is halfway between 21 and 637?" 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=637.

Halfway Between Line

To find the number halfway between 21 and 637, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 637 into our formula, we get:

(21 + 637)/2 = 329

Thus, the number halfway between 21 and 637 is 329.

To check that our answer is correct, we subtract 21 from 329 and subtract 329 from 637 and compare the two numbers:

329 - 21 = 308
637 - 329 = 308

As you can see, the halfway number is 308 higher than 21 and 308 lower than 637. Therefore, our halfway between answer of 329 above is correct.

Halfway Between
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Halfway Between 21 and 638
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