When you ask "What number is halfway between 42 and 817?" 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=817.
To find the number halfway between 42 and 817, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 817 into our formula, we get:
(42 + 817)/2 = 429.5
Thus, the number halfway between 42 and 817 is 429.5.
To check that our answer is correct, we subtract 42 from 429.5 and subtract 429.5 from 817 and compare the two numbers:
429.5 - 42 = 387.5
817 - 429.5 = 387.5
As you can see, the halfway number is 387.5 higher than 42 and 387.5 lower than 817. Therefore, our halfway between answer of 429.5 above is correct.
Halfway Between
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Halfway Between 42 and 818
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