When you ask "What number is halfway between 87 and 638?" 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=638.
To find the number halfway between 87 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 638 into our formula, we get:
(87 + 638)/2 = 362.5
Thus, the number halfway between 87 and 638 is 362.5.
To check that our answer is correct, we subtract 87 from 362.5 and subtract 362.5 from 638 and compare the two numbers:
362.5 - 87 = 275.5
638 - 362.5 = 275.5
As you can see, the halfway number is 275.5 higher than 87 and 275.5 lower than 638. Therefore, our halfway between answer of 362.5 above is correct.
Halfway Between
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Halfway Between 87 and 639
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