When you ask "What number is halfway between 42 and 821?" 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=821.
To find the number halfway between 42 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 821 into our formula, we get:
(42 + 821)/2 = 431.5
Thus, the number halfway between 42 and 821 is 431.5.
To check that our answer is correct, we subtract 42 from 431.5 and subtract 431.5 from 821 and compare the two numbers:
431.5 - 42 = 389.5
821 - 431.5 = 389.5
As you can see, the halfway number is 389.5 higher than 42 and 389.5 lower than 821. Therefore, our halfway between answer of 431.5 above is correct.
Halfway Between
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Halfway Between 42 and 822
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