When you ask "What number is halfway between 31 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=31 and Y=213.
To find the number halfway between 31 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 213 into our formula, we get:
(31 + 213)/2 = 122
Thus, the number halfway between 31 and 213 is 122.
To check that our answer is correct, we subtract 31 from 122 and subtract 122 from 213 and compare the two numbers:
122 - 31 = 91
213 - 122 = 91
As you can see, the halfway number is 91 higher than 31 and 91 lower than 213. Therefore, our halfway between answer of 122 above is correct.
Halfway Between
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Halfway Between 31 and 214
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