When you ask "What number is halfway between 9 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=9 and Y=218.
To find the number halfway between 9 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 218 into our formula, we get:
(9 + 218)/2 = 113.5
Thus, the number halfway between 9 and 218 is 113.5.
To check that our answer is correct, we subtract 9 from 113.5 and subtract 113.5 from 218 and compare the two numbers:
113.5 - 9 = 104.5
218 - 113.5 = 104.5
As you can see, the halfway number is 104.5 higher than 9 and 104.5 lower than 218. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 9 and 219
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