When you ask "What number is halfway between 86 and 231?" 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=231.
To find the number halfway between 86 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 231 into our formula, we get:
(86 + 231)/2 = 158.5
Thus, the number halfway between 86 and 231 is 158.5.
To check that our answer is correct, we subtract 86 from 158.5 and subtract 158.5 from 231 and compare the two numbers:
158.5 - 86 = 72.5
231 - 158.5 = 72.5
As you can see, the halfway number is 72.5 higher than 86 and 72.5 lower than 231. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 86 and 232
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