When you ask "What number is halfway between 77 and 156?" 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=156.
To find the number halfway between 77 and 156, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 156 into our formula, we get:
(77 + 156)/2 = 116.5
Thus, the number halfway between 77 and 156 is 116.5.
To check that our answer is correct, we subtract 77 from 116.5 and subtract 116.5 from 156 and compare the two numbers:
116.5 - 77 = 39.5
156 - 116.5 = 39.5
As you can see, the halfway number is 39.5 higher than 77 and 39.5 lower than 156. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 77 and 157
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