When you ask "What number is halfway between 87 and 490?" 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=490.
To find the number halfway between 87 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 490 into our formula, we get:
(87 + 490)/2 = 288.5
Thus, the number halfway between 87 and 490 is 288.5.
To check that our answer is correct, we subtract 87 from 288.5 and subtract 288.5 from 490 and compare the two numbers:
288.5 - 87 = 201.5
490 - 288.5 = 201.5
As you can see, the halfway number is 201.5 higher than 87 and 201.5 lower than 490. Therefore, our halfway between answer of 288.5 above is correct.
Halfway Between
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Halfway Between 87 and 491
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