When you ask "What number is halfway between 21 and 984?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=984.
To find the number halfway between 21 and 984, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 984 into our formula, we get:
(21 + 984)/2 = 502.5
Thus, the number halfway between 21 and 984 is 502.5.
To check that our answer is correct, we subtract 21 from 502.5 and subtract 502.5 from 984 and compare the two numbers:
502.5 - 21 = 481.5
984 - 502.5 = 481.5
As you can see, the halfway number is 481.5 higher than 21 and 481.5 lower than 984. Therefore, our halfway between answer of 502.5 above is correct.
Halfway Between
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Halfway Between 21 and 985
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