When you ask "What number is halfway between 21 and 115?" 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=115.
To find the number halfway between 21 and 115, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 115 into our formula, we get:
(21 + 115)/2 = 68
Thus, the number halfway between 21 and 115 is 68.
To check that our answer is correct, we subtract 21 from 68 and subtract 68 from 115 and compare the two numbers:
68 - 21 = 47
115 - 68 = 47
As you can see, the halfway number is 47 higher than 21 and 47 lower than 115. Therefore, our halfway between answer of 68 above is correct.
Halfway Between
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Halfway Between 21 and 116
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