When you ask "What number is halfway between 90 and 387?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=387.
To find the number halfway between 90 and 387, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 387 into our formula, we get:
(90 + 387)/2 = 238.5
Thus, the number halfway between 90 and 387 is 238.5.
To check that our answer is correct, we subtract 90 from 238.5 and subtract 238.5 from 387 and compare the two numbers:
238.5 - 90 = 148.5
387 - 238.5 = 148.5
As you can see, the halfway number is 148.5 higher than 90 and 148.5 lower than 387. Therefore, our halfway between answer of 238.5 above is correct.
Halfway Between
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Halfway Between 90 and 388
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