When you ask "What number is halfway between 9 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=9 and Y=324.
To find the number halfway between 9 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 324 into our formula, we get:
(9 + 324)/2 = 166.5
Thus, the number halfway between 9 and 324 is 166.5.
To check that our answer is correct, we subtract 9 from 166.5 and subtract 166.5 from 324 and compare the two numbers:
166.5 - 9 = 157.5
324 - 166.5 = 157.5
As you can see, the halfway number is 157.5 higher than 9 and 157.5 lower than 324. Therefore, our halfway between answer of 166.5 above is correct.
Halfway Between
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Halfway Between 9 and 325
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