When you ask "What number is halfway between 18 and 177?" 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=177.
To find the number halfway between 18 and 177, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 177 into our formula, we get:
(18 + 177)/2 = 97.5
Thus, the number halfway between 18 and 177 is 97.5.
To check that our answer is correct, we subtract 18 from 97.5 and subtract 97.5 from 177 and compare the two numbers:
97.5 - 18 = 79.5
177 - 97.5 = 79.5
As you can see, the halfway number is 79.5 higher than 18 and 79.5 lower than 177. Therefore, our halfway between answer of 97.5 above is correct.
Halfway Between
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Halfway Between 18 and 178
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