When you ask "What number is halfway between 86 and 157?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=86 and Y=157.
To find the number halfway between 86 and 157, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 157 into our formula, we get:
(86 + 157)/2 = 121.5
Thus, the number halfway between 86 and 157 is 121.5.
To check that our answer is correct, we subtract 86 from 121.5 and subtract 121.5 from 157 and compare the two numbers:
121.5 - 86 = 35.5
157 - 121.5 = 35.5
As you can see, the halfway number is 35.5 higher than 86 and 35.5 lower than 157. Therefore, our halfway between answer of 121.5 above is correct.
Halfway Between
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Halfway Between 86 and 158
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