When you ask "What number is halfway between 21 and 630?" 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=630.
To find the number halfway between 21 and 630, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 630 into our formula, we get:
(21 + 630)/2 = 325.5
Thus, the number halfway between 21 and 630 is 325.5.
To check that our answer is correct, we subtract 21 from 325.5 and subtract 325.5 from 630 and compare the two numbers:
325.5 - 21 = 304.5
630 - 325.5 = 304.5
As you can see, the halfway number is 304.5 higher than 21 and 304.5 lower than 630. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 21 and 631
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