When you ask "What number is halfway between 18 and 171?" 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=171.
To find the number halfway between 18 and 171, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 171 into our formula, we get:
(18 + 171)/2 = 94.5
Thus, the number halfway between 18 and 171 is 94.5.
To check that our answer is correct, we subtract 18 from 94.5 and subtract 94.5 from 171 and compare the two numbers:
94.5 - 18 = 76.5
171 - 94.5 = 76.5
As you can see, the halfway number is 76.5 higher than 18 and 76.5 lower than 171. Therefore, our halfway between answer of 94.5 above is correct.
Halfway Between
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Halfway Between 18 and 172
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