When you ask "What number is halfway between 21 and 484?" 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=484.
To find the number halfway between 21 and 484, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 484 into our formula, we get:
(21 + 484)/2 = 252.5
Thus, the number halfway between 21 and 484 is 252.5.
To check that our answer is correct, we subtract 21 from 252.5 and subtract 252.5 from 484 and compare the two numbers:
252.5 - 21 = 231.5
484 - 252.5 = 231.5
As you can see, the halfway number is 231.5 higher than 21 and 231.5 lower than 484. Therefore, our halfway between answer of 252.5 above is correct.
Halfway Between
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Halfway Between 21 and 485
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