When you ask "What number is halfway between 86 and 143?" 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=143.
To find the number halfway between 86 and 143, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 143 into our formula, we get:
(86 + 143)/2 = 114.5
Thus, the number halfway between 86 and 143 is 114.5.
To check that our answer is correct, we subtract 86 from 114.5 and subtract 114.5 from 143 and compare the two numbers:
114.5 - 86 = 28.5
143 - 114.5 = 28.5
As you can see, the halfway number is 28.5 higher than 86 and 28.5 lower than 143. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 86 and 144
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