When you ask "What number is halfway between 18 and 180?" 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=180.
To find the number halfway between 18 and 180, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 180 into our formula, we get:
(18 + 180)/2 = 99
Thus, the number halfway between 18 and 180 is 99.
To check that our answer is correct, we subtract 18 from 99 and subtract 99 from 180 and compare the two numbers:
99 - 18 = 81
180 - 99 = 81
As you can see, the halfway number is 81 higher than 18 and 81 lower than 180. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 18 and 181
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