When you ask "What number is halfway between 42 and 391?" 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=391.
To find the number halfway between 42 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 391 into our formula, we get:
(42 + 391)/2 = 216.5
Thus, the number halfway between 42 and 391 is 216.5.
To check that our answer is correct, we subtract 42 from 216.5 and subtract 216.5 from 391 and compare the two numbers:
216.5 - 42 = 174.5
391 - 216.5 = 174.5
As you can see, the halfway number is 174.5 higher than 42 and 174.5 lower than 391. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 42 and 392
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