When you ask "What number is halfway between 21 and 117?" 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=117.
To find the number halfway between 21 and 117, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 117 into our formula, we get:
(21 + 117)/2 = 69
Thus, the number halfway between 21 and 117 is 69.
To check that our answer is correct, we subtract 21 from 69 and subtract 69 from 117 and compare the two numbers:
69 - 21 = 48
117 - 69 = 48
As you can see, the halfway number is 48 higher than 21 and 48 lower than 117. Therefore, our halfway between answer of 69 above is correct.
Halfway Between
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Halfway Between 21 and 118
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