When you ask "What number is halfway between 21 and 216?" 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=216.
To find the number halfway between 21 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 216 into our formula, we get:
(21 + 216)/2 = 118.5
Thus, the number halfway between 21 and 216 is 118.5.
To check that our answer is correct, we subtract 21 from 118.5 and subtract 118.5 from 216 and compare the two numbers:
118.5 - 21 = 97.5
216 - 118.5 = 97.5
As you can see, the halfway number is 97.5 higher than 21 and 97.5 lower than 216. Therefore, our halfway between answer of 118.5 above is correct.
Halfway Between
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Halfway Between 21 and 217
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