
When you ask "What number is halfway between 21 and 651?" 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=651.

To find the number halfway between 21 and 651, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 651 into our formula, we get:
(21 + 651)/2 = 336
Thus, the number halfway between 21 and 651 is 336.
To check that our answer is correct, we subtract 21 from 336 and subtract 336 from 651 and compare the two numbers:
336 - 21 = 315
651 - 336 = 315
As you can see, the halfway number is 315 higher than 21 and 315 lower than 651. Therefore, our halfway between answer of 336 above is correct.
Halfway Between
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Halfway Between 21 and 652
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