When you ask "What number is halfway between 18 and 321?" 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=321.
To find the number halfway between 18 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 321 into our formula, we get:
(18 + 321)/2 = 169.5
Thus, the number halfway between 18 and 321 is 169.5.
To check that our answer is correct, we subtract 18 from 169.5 and subtract 169.5 from 321 and compare the two numbers:
169.5 - 18 = 151.5
321 - 169.5 = 151.5
As you can see, the halfway number is 151.5 higher than 18 and 151.5 lower than 321. Therefore, our halfway between answer of 169.5 above is correct.
Halfway Between
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Halfway Between 18 and 322
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