
When you ask "What number is halfway between 42 and 880?" 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=880.

To find the number halfway between 42 and 880, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 880 into our formula, we get:
(42 + 880)/2 = 461
Thus, the number halfway between 42 and 880 is 461.
To check that our answer is correct, we subtract 42 from 461 and subtract 461 from 880 and compare the two numbers:
461 - 42 = 419
880 - 461 = 419
As you can see, the halfway number is 419 higher than 42 and 419 lower than 880. Therefore, our halfway between answer of 461 above is correct.
Halfway Between
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Halfway Between 42 and 881
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