When you ask "What number is halfway between 15 and 42?" 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=42.
To find the number halfway between 15 and 42, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 42 into our formula, we get:
(15 + 42)/2 = 28.5
Thus, the number halfway between 15 and 42 is 28.5.
To check that our answer is correct, we subtract 15 from 28.5 and subtract 28.5 from 42 and compare the two numbers:
28.5 - 15 = 13.5
42 - 28.5 = 13.5
As you can see, the halfway number is 13.5 higher than 15 and 13.5 lower than 42. Therefore, our halfway between answer of 28.5 above is correct.
Halfway Between
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Halfway Between 15 and 43
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