When you ask "What number is halfway between 15 and 28?" 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=28.
To find the number halfway between 15 and 28, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 28 into our formula, we get:
(15 + 28)/2 = 21.5
Thus, the number halfway between 15 and 28 is 21.5.
To check that our answer is correct, we subtract 15 from 21.5 and subtract 21.5 from 28 and compare the two numbers:
21.5 - 15 = 6.5
28 - 21.5 = 6.5
As you can see, the halfway number is 6.5 higher than 15 and 6.5 lower than 28. Therefore, our halfway between answer of 21.5 above is correct.
Halfway Between
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Halfway Between 15 and 29
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