When you ask "What number is halfway between 21 and 304?" 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=304.
To find the number halfway between 21 and 304, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 304 into our formula, we get:
(21 + 304)/2 = 162.5
Thus, the number halfway between 21 and 304 is 162.5.
To check that our answer is correct, we subtract 21 from 162.5 and subtract 162.5 from 304 and compare the two numbers:
162.5 - 21 = 141.5
304 - 162.5 = 141.5
As you can see, the halfway number is 141.5 higher than 21 and 141.5 lower than 304. Therefore, our halfway between answer of 162.5 above is correct.
Halfway Between
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Halfway Between 21 and 305
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