When you ask "What number is halfway between 86 and 151?" 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=151.
To find the number halfway between 86 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 151 into our formula, we get:
(86 + 151)/2 = 118.5
Thus, the number halfway between 86 and 151 is 118.5.
To check that our answer is correct, we subtract 86 from 118.5 and subtract 118.5 from 151 and compare the two numbers:
118.5 - 86 = 32.5
151 - 118.5 = 32.5
As you can see, the halfway number is 32.5 higher than 86 and 32.5 lower than 151. Therefore, our halfway between answer of 118.5 above is correct.
Halfway Between
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Halfway Between 86 and 152
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