When you ask "What number is halfway between 57 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=57 and Y=216.
To find the number halfway between 57 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 216 into our formula, we get:
(57 + 216)/2 = 136.5
Thus, the number halfway between 57 and 216 is 136.5.
To check that our answer is correct, we subtract 57 from 136.5 and subtract 136.5 from 216 and compare the two numbers:
136.5 - 57 = 79.5
216 - 136.5 = 79.5
As you can see, the halfway number is 79.5 higher than 57 and 79.5 lower than 216. Therefore, our halfway between answer of 136.5 above is correct.
Halfway Between
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Halfway Between 57 and 217
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