When you ask "What number is halfway between 84 and 621?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=621.
To find the number halfway between 84 and 621, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 621 into our formula, we get:
(84 + 621)/2 = 352.5
Thus, the number halfway between 84 and 621 is 352.5.
To check that our answer is correct, we subtract 84 from 352.5 and subtract 352.5 from 621 and compare the two numbers:
352.5 - 84 = 268.5
621 - 352.5 = 268.5
As you can see, the halfway number is 268.5 higher than 84 and 268.5 lower than 621. Therefore, our halfway between answer of 352.5 above is correct.
Halfway Between
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Halfway Between 84 and 622
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