When you ask "What number is halfway between 21 and 36?" 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=36.
To find the number halfway between 21 and 36, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 36 into our formula, we get:
(21 + 36)/2 = 28.5
Thus, the number halfway between 21 and 36 is 28.5.
To check that our answer is correct, we subtract 21 from 28.5 and subtract 28.5 from 36 and compare the two numbers:
28.5 - 21 = 7.5
36 - 28.5 = 7.5
As you can see, the halfway number is 7.5 higher than 21 and 7.5 lower than 36. Therefore, our halfway between answer of 28.5 above is correct.
Halfway Between
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Halfway Between 21 and 37
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