When you ask "What number is halfway between 15 and 30?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=30.
To find the number halfway between 15 and 30, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 30 into our formula, we get:
(15 + 30)/2 = 22.5
Thus, the number halfway between 15 and 30 is 22.5.
To check that our answer is correct, we subtract 15 from 22.5 and subtract 22.5 from 30 and compare the two numbers:
22.5 - 15 = 7.5
30 - 22.5 = 7.5
As you can see, the halfway number is 7.5 higher than 15 and 7.5 lower than 30. Therefore, our halfway between answer of 22.5 above is correct.
Halfway Between
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Halfway Between 15 and 31
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