When you ask "What number is halfway between 87 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=87 and Y=509.
To find the number halfway between 87 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 509 into our formula, we get:
(87 + 509)/2 = 298
Thus, the number halfway between 87 and 509 is 298.
To check that our answer is correct, we subtract 87 from 298 and subtract 298 from 509 and compare the two numbers:
298 - 87 = 211
509 - 298 = 211
As you can see, the halfway number is 211 higher than 87 and 211 lower than 509. Therefore, our halfway between answer of 298 above is correct.
Halfway Between
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Halfway Between 87 and 510
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