When you ask "What number is halfway between 18 and 191?" 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=191.
To find the number halfway between 18 and 191, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 191 into our formula, we get:
(18 + 191)/2 = 104.5
Thus, the number halfway between 18 and 191 is 104.5.
To check that our answer is correct, we subtract 18 from 104.5 and subtract 104.5 from 191 and compare the two numbers:
104.5 - 18 = 86.5
191 - 104.5 = 86.5
As you can see, the halfway number is 86.5 higher than 18 and 86.5 lower than 191. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 18 and 192
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