When you ask "What number is halfway between 18 and 325?" 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=325.
To find the number halfway between 18 and 325, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 325 into our formula, we get:
(18 + 325)/2 = 171.5
Thus, the number halfway between 18 and 325 is 171.5.
To check that our answer is correct, we subtract 18 from 171.5 and subtract 171.5 from 325 and compare the two numbers:
171.5 - 18 = 153.5
325 - 171.5 = 153.5
As you can see, the halfway number is 153.5 higher than 18 and 153.5 lower than 325. Therefore, our halfway between answer of 171.5 above is correct.
Halfway Between
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Halfway Between 18 and 326
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