When you ask "What number is halfway between 18 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=18 and Y=324.
To find the number halfway between 18 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 324 into our formula, we get:
(18 + 324)/2 = 171
Thus, the number halfway between 18 and 324 is 171.
To check that our answer is correct, we subtract 18 from 171 and subtract 171 from 324 and compare the two numbers:
171 - 18 = 153
324 - 171 = 153
As you can see, the halfway number is 153 higher than 18 and 153 lower than 324. Therefore, our halfway between answer of 171 above is correct.
Halfway Between
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Halfway Between 18 and 325
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