When you ask "What number is halfway between 22 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=22 and Y=817.
To find the number halfway between 22 and 817, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 817 into our formula, we get:
(22 + 817)/2 = 419.5
Thus, the number halfway between 22 and 817 is 419.5.
To check that our answer is correct, we subtract 22 from 419.5 and subtract 419.5 from 817 and compare the two numbers:
419.5 - 22 = 397.5
817 - 419.5 = 397.5
As you can see, the halfway number is 397.5 higher than 22 and 397.5 lower than 817. Therefore, our halfway between answer of 419.5 above is correct.
Halfway Between
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Halfway Between 22 and 818
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