When you ask "What number is halfway between 31 and 215?" 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=215.
To find the number halfway between 31 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 215 into our formula, we get:
(31 + 215)/2 = 123
Thus, the number halfway between 31 and 215 is 123.
To check that our answer is correct, we subtract 31 from 123 and subtract 123 from 215 and compare the two numbers:
123 - 31 = 92
215 - 123 = 92
As you can see, the halfway number is 92 higher than 31 and 92 lower than 215. Therefore, our halfway between answer of 123 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 31 and 216
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