When you ask "What number is halfway between 18 and 55?" 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=55.
To find the number halfway between 18 and 55, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 55 into our formula, we get:
(18 + 55)/2 = 36.5
Thus, the number halfway between 18 and 55 is 36.5.
To check that our answer is correct, we subtract 18 from 36.5 and subtract 36.5 from 55 and compare the two numbers:
36.5 - 18 = 18.5
55 - 36.5 = 18.5
As you can see, the halfway number is 18.5 higher than 18 and 18.5 lower than 55. Therefore, our halfway between answer of 36.5 above is correct.
Halfway Between
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Halfway Between 18 and 56
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