When you ask "What number is halfway between 30 and 181?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=181.
To find the number halfway between 30 and 181, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 181 into our formula, we get:
(30 + 181)/2 = 105.5
Thus, the number halfway between 30 and 181 is 105.5.
To check that our answer is correct, we subtract 30 from 105.5 and subtract 105.5 from 181 and compare the two numbers:
105.5 - 30 = 75.5
181 - 105.5 = 75.5
As you can see, the halfway number is 75.5 higher than 30 and 75.5 lower than 181. Therefore, our halfway between answer of 105.5 above is correct.
Halfway Between
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Halfway Between 30 and 182
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