When you ask "What number is halfway between 18 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=18 and Y=821.
To find the number halfway between 18 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 821 into our formula, we get:
(18 + 821)/2 = 419.5
Thus, the number halfway between 18 and 821 is 419.5.
To check that our answer is correct, we subtract 18 from 419.5 and subtract 419.5 from 821 and compare the two numbers:
419.5 - 18 = 401.5
821 - 419.5 = 401.5
As you can see, the halfway number is 401.5 higher than 18 and 401.5 lower than 821. Therefore, our halfway between answer of 419.5 above is correct.
Halfway Between
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Halfway Between 18 and 822
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