When you ask "What number is halfway between 15 and 418?" 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=418.
To find the number halfway between 15 and 418, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 418 into our formula, we get:
(15 + 418)/2 = 216.5
Thus, the number halfway between 15 and 418 is 216.5.
To check that our answer is correct, we subtract 15 from 216.5 and subtract 216.5 from 418 and compare the two numbers:
216.5 - 15 = 201.5
418 - 216.5 = 201.5
As you can see, the halfway number is 201.5 higher than 15 and 201.5 lower than 418. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 15 and 419
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