When you ask "What number is halfway between 86 and 409?" 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=409.
To find the number halfway between 86 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 409 into our formula, we get:
(86 + 409)/2 = 247.5
Thus, the number halfway between 86 and 409 is 247.5.
To check that our answer is correct, we subtract 86 from 247.5 and subtract 247.5 from 409 and compare the two numbers:
247.5 - 86 = 161.5
409 - 247.5 = 161.5
As you can see, the halfway number is 161.5 higher than 86 and 161.5 lower than 409. Therefore, our halfway between answer of 247.5 above is correct.
Halfway Between
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Halfway Between 86 and 410
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