When you ask "What number is halfway between 17 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=17 and Y=213.
To find the number halfway between 17 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 213 into our formula, we get:
(17 + 213)/2 = 115
Thus, the number halfway between 17 and 213 is 115.
To check that our answer is correct, we subtract 17 from 115 and subtract 115 from 213 and compare the two numbers:
115 - 17 = 98
213 - 115 = 98
As you can see, the halfway number is 98 higher than 17 and 98 lower than 213. Therefore, our halfway between answer of 115 above is correct.
Halfway Between
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Halfway Between 17 and 214
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