When you ask "What number is halfway between 21 and 324?" 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=324.
To find the number halfway between 21 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 324 into our formula, we get:
(21 + 324)/2 = 172.5
Thus, the number halfway between 21 and 324 is 172.5.
To check that our answer is correct, we subtract 21 from 172.5 and subtract 172.5 from 324 and compare the two numbers:
172.5 - 21 = 151.5
324 - 172.5 = 151.5
As you can see, the halfway number is 151.5 higher than 21 and 151.5 lower than 324. Therefore, our halfway between answer of 172.5 above is correct.
Halfway Between
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Halfway Between 21 and 325
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