When you ask "What number is halfway between 18 and 57?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=57.
To find the number halfway between 18 and 57, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 57 into our formula, we get:
(18 + 57)/2 = 37.5
Thus, the number halfway between 18 and 57 is 37.5.
To check that our answer is correct, we subtract 18 from 37.5 and subtract 37.5 from 57 and compare the two numbers:
37.5 - 18 = 19.5
57 - 37.5 = 19.5
As you can see, the halfway number is 19.5 higher than 18 and 19.5 lower than 57. Therefore, our halfway between answer of 37.5 above is correct.
Halfway Between
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Halfway Between 18 and 58
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