When you ask "What number is halfway between 15 and 278?" 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=278.
To find the number halfway between 15 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 278 into our formula, we get:
(15 + 278)/2 = 146.5
Thus, the number halfway between 15 and 278 is 146.5.
To check that our answer is correct, we subtract 15 from 146.5 and subtract 146.5 from 278 and compare the two numbers:
146.5 - 15 = 131.5
278 - 146.5 = 131.5
As you can see, the halfway number is 131.5 higher than 15 and 131.5 lower than 278. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 15 and 279
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