When you ask "What number is halfway between 99 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=99 and Y=387.
To find the number halfway between 99 and 387, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 387 into our formula, we get:
(99 + 387)/2 = 243
Thus, the number halfway between 99 and 387 is 243.
To check that our answer is correct, we subtract 99 from 243 and subtract 243 from 387 and compare the two numbers:
243 - 99 = 144
387 - 243 = 144
As you can see, the halfway number is 144 higher than 99 and 144 lower than 387. Therefore, our halfway between answer of 243 above is correct.
Halfway Between
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Halfway Between 99 and 388
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