When you ask "What number is halfway between 21 and 63?" 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=63.
To find the number halfway between 21 and 63, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 63 into our formula, we get:
(21 + 63)/2 = 42
Thus, the number halfway between 21 and 63 is 42.
To check that our answer is correct, we subtract 21 from 42 and subtract 42 from 63 and compare the two numbers:
42 - 21 = 21
63 - 42 = 21
As you can see, the halfway number is 21 higher than 21 and 21 lower than 63. Therefore, our halfway between answer of 42 above is correct.
Halfway Between
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Halfway Between 21 and 64
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