When you ask "What number is halfway between 21 and 636?" 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=636.
To find the number halfway between 21 and 636, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 636 into our formula, we get:
(21 + 636)/2 = 328.5
Thus, the number halfway between 21 and 636 is 328.5.
To check that our answer is correct, we subtract 21 from 328.5 and subtract 328.5 from 636 and compare the two numbers:
328.5 - 21 = 307.5
636 - 328.5 = 307.5
As you can see, the halfway number is 307.5 higher than 21 and 307.5 lower than 636. Therefore, our halfway between answer of 328.5 above is correct.
Halfway Between
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Halfway Between 21 and 637
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