When you ask "What number is halfway between 86 and 509?" 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=509.
To find the number halfway between 86 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 509 into our formula, we get:
(86 + 509)/2 = 297.5
Thus, the number halfway between 86 and 509 is 297.5.
To check that our answer is correct, we subtract 86 from 297.5 and subtract 297.5 from 509 and compare the two numbers:
297.5 - 86 = 211.5
509 - 297.5 = 211.5
As you can see, the halfway number is 211.5 higher than 86 and 211.5 lower than 509. Therefore, our halfway between answer of 297.5 above is correct.
Halfway Between
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Halfway Between 86 and 510
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