When you ask "What number is halfway between 81 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=81 and Y=324.
To find the number halfway between 81 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 324 into our formula, we get:
(81 + 324)/2 = 202.5
Thus, the number halfway between 81 and 324 is 202.5.
To check that our answer is correct, we subtract 81 from 202.5 and subtract 202.5 from 324 and compare the two numbers:
202.5 - 81 = 121.5
324 - 202.5 = 121.5
As you can see, the halfway number is 121.5 higher than 81 and 121.5 lower than 324. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 81 and 325
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