When you ask "What number is halfway between 15 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=15 and Y=218.
To find the number halfway between 15 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 218 into our formula, we get:
(15 + 218)/2 = 116.5
Thus, the number halfway between 15 and 218 is 116.5.
To check that our answer is correct, we subtract 15 from 116.5 and subtract 116.5 from 218 and compare the two numbers:
116.5 - 15 = 101.5
218 - 116.5 = 101.5
As you can see, the halfway number is 101.5 higher than 15 and 101.5 lower than 218. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 15 and 219
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