When you ask "What number is halfway between 31 and 249?" 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=249.
To find the number halfway between 31 and 249, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 249 into our formula, we get:
(31 + 249)/2 = 140
Thus, the number halfway between 31 and 249 is 140.
To check that our answer is correct, we subtract 31 from 140 and subtract 140 from 249 and compare the two numbers:
140 - 31 = 109
249 - 140 = 109
As you can see, the halfway number is 109 higher than 31 and 109 lower than 249. Therefore, our halfway between answer of 140 above is correct.
Halfway Between
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Halfway Between 31 and 250
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