
When you ask "What number is halfway between 21 and 86?" 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=86.

To find the number halfway between 21 and 86, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 86 into our formula, we get:
(21 + 86)/2 = 53.5
Thus, the number halfway between 21 and 86 is 53.5.
To check that our answer is correct, we subtract 21 from 53.5 and subtract 53.5 from 86 and compare the two numbers:
53.5 - 21 = 32.5
86 - 53.5 = 32.5
As you can see, the halfway number is 32.5 higher than 21 and 32.5 lower than 86. Therefore, our halfway between answer of 53.5 above is correct.
Halfway Between
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Halfway Between 21 and 87
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