When you ask "What number is halfway between 18 and 218?" 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=218.
To find the number halfway between 18 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 218 into our formula, we get:
(18 + 218)/2 = 118
Thus, the number halfway between 18 and 218 is 118.
To check that our answer is correct, we subtract 18 from 118 and subtract 118 from 218 and compare the two numbers:
118 - 18 = 100
218 - 118 = 100
As you can see, the halfway number is 100 higher than 18 and 100 lower than 218. Therefore, our halfway between answer of 118 above is correct.
Halfway Between
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Halfway Between 18 and 219
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