When you ask "What number is halfway between 86 and 213?" 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=213.
To find the number halfway between 86 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 213 into our formula, we get:
(86 + 213)/2 = 149.5
Thus, the number halfway between 86 and 213 is 149.5.
To check that our answer is correct, we subtract 86 from 149.5 and subtract 149.5 from 213 and compare the two numbers:
149.5 - 86 = 63.5
213 - 149.5 = 63.5
As you can see, the halfway number is 63.5 higher than 86 and 63.5 lower than 213. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 86 and 214
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