When you ask "What number is halfway between 86 and 221?" 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=221.
To find the number halfway between 86 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 221 into our formula, we get:
(86 + 221)/2 = 153.5
Thus, the number halfway between 86 and 221 is 153.5.
To check that our answer is correct, we subtract 86 from 153.5 and subtract 153.5 from 221 and compare the two numbers:
153.5 - 86 = 67.5
221 - 153.5 = 67.5
As you can see, the halfway number is 67.5 higher than 86 and 67.5 lower than 221. Therefore, our halfway between answer of 153.5 above is correct.
Halfway Between
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Halfway Between 86 and 222
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