When you ask "What number is halfway between 30 and 213?" 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=213.
To find the number halfway between 30 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 213 into our formula, we get:
(30 + 213)/2 = 121.5
Thus, the number halfway between 30 and 213 is 121.5.
To check that our answer is correct, we subtract 30 from 121.5 and subtract 121.5 from 213 and compare the two numbers:
121.5 - 30 = 91.5
213 - 121.5 = 91.5
As you can see, the halfway number is 91.5 higher than 30 and 91.5 lower than 213. Therefore, our halfway between answer of 121.5 above is correct.
Halfway Between
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Halfway Between 30 and 214
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