When you ask "What number is halfway between 31 and 218?" 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=218.
To find the number halfway between 31 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 218 into our formula, we get:
(31 + 218)/2 = 124.5
Thus, the number halfway between 31 and 218 is 124.5.
To check that our answer is correct, we subtract 31 from 124.5 and subtract 124.5 from 218 and compare the two numbers:
124.5 - 31 = 93.5
218 - 124.5 = 93.5
As you can see, the halfway number is 93.5 higher than 31 and 93.5 lower than 218. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 31 and 219
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