When you ask "What number is halfway between 31 and 239?" 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=239.
To find the number halfway between 31 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 239 into our formula, we get:
(31 + 239)/2 = 135
Thus, the number halfway between 31 and 239 is 135.
To check that our answer is correct, we subtract 31 from 135 and subtract 135 from 239 and compare the two numbers:
135 - 31 = 104
239 - 135 = 104
As you can see, the halfway number is 104 higher than 31 and 104 lower than 239. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 31 and 240
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