When you ask "What number is halfway between 18 and 311?" 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=311.
To find the number halfway between 18 and 311, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 311 into our formula, we get:
(18 + 311)/2 = 164.5
Thus, the number halfway between 18 and 311 is 164.5.
To check that our answer is correct, we subtract 18 from 164.5 and subtract 164.5 from 311 and compare the two numbers:
164.5 - 18 = 146.5
311 - 164.5 = 146.5
As you can see, the halfway number is 146.5 higher than 18 and 146.5 lower than 311. Therefore, our halfway between answer of 164.5 above is correct.
Halfway Between
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Halfway Between 18 and 312
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