When you ask "What number is halfway between 18 and 151?" 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=151.
To find the number halfway between 18 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 151 into our formula, we get:
(18 + 151)/2 = 84.5
Thus, the number halfway between 18 and 151 is 84.5.
To check that our answer is correct, we subtract 18 from 84.5 and subtract 84.5 from 151 and compare the two numbers:
84.5 - 18 = 66.5
151 - 84.5 = 66.5
As you can see, the halfway number is 66.5 higher than 18 and 66.5 lower than 151. Therefore, our halfway between answer of 84.5 above is correct.
Halfway Between
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Halfway Between 18 and 152
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