When you ask "What number is halfway between 21 and 624?" 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=624.
To find the number halfway between 21 and 624, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 624 into our formula, we get:
(21 + 624)/2 = 322.5
Thus, the number halfway between 21 and 624 is 322.5.
To check that our answer is correct, we subtract 21 from 322.5 and subtract 322.5 from 624 and compare the two numbers:
322.5 - 21 = 301.5
624 - 322.5 = 301.5
As you can see, the halfway number is 301.5 higher than 21 and 301.5 lower than 624. Therefore, our halfway between answer of 322.5 above is correct.
Halfway Between
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Halfway Between 21 and 625
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