When you ask "What number is halfway between 9 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=9 and Y=213.
To find the number halfway between 9 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 213 into our formula, we get:
(9 + 213)/2 = 111
Thus, the number halfway between 9 and 213 is 111.
To check that our answer is correct, we subtract 9 from 111 and subtract 111 from 213 and compare the two numbers:
111 - 9 = 102
213 - 111 = 102
As you can see, the halfway number is 102 higher than 9 and 102 lower than 213. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 9 and 214
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