When you ask "What number is halfway between 77 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=77 and Y=216.
To find the number halfway between 77 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 216 into our formula, we get:
(77 + 216)/2 = 146.5
Thus, the number halfway between 77 and 216 is 146.5.
To check that our answer is correct, we subtract 77 from 146.5 and subtract 146.5 from 216 and compare the two numbers:
146.5 - 77 = 69.5
216 - 146.5 = 69.5
As you can see, the halfway number is 69.5 higher than 77 and 69.5 lower than 216. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 77 and 217
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