When you ask "What number is halfway between 17 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=17 and Y=156.
To find the number halfway between 17 and 156, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 156 into our formula, we get:
(17 + 156)/2 = 86.5
Thus, the number halfway between 17 and 156 is 86.5.
To check that our answer is correct, we subtract 17 from 86.5 and subtract 86.5 from 156 and compare the two numbers:
86.5 - 17 = 69.5
156 - 86.5 = 69.5
As you can see, the halfway number is 69.5 higher than 17 and 69.5 lower than 156. Therefore, our halfway between answer of 86.5 above is correct.
Halfway Between
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Halfway Between 17 and 157
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