When you ask "What number is halfway between 18 and 285?" 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=285.
To find the number halfway between 18 and 285, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 285 into our formula, we get:
(18 + 285)/2 = 151.5
Thus, the number halfway between 18 and 285 is 151.5.
To check that our answer is correct, we subtract 18 from 151.5 and subtract 151.5 from 285 and compare the two numbers:
151.5 - 18 = 133.5
285 - 151.5 = 133.5
As you can see, the halfway number is 133.5 higher than 18 and 133.5 lower than 285. Therefore, our halfway between answer of 151.5 above is correct.
Halfway Between
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Halfway Between 18 and 286
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