When you ask "What number is halfway between 42 and 315?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=315.
To find the number halfway between 42 and 315, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 315 into our formula, we get:
(42 + 315)/2 = 178.5
Thus, the number halfway between 42 and 315 is 178.5.
To check that our answer is correct, we subtract 42 from 178.5 and subtract 178.5 from 315 and compare the two numbers:
178.5 - 42 = 136.5
315 - 178.5 = 136.5
As you can see, the halfway number is 136.5 higher than 42 and 136.5 lower than 315. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 42 and 316
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