When you ask "What number is halfway between 31 and 259?" 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=259.
To find the number halfway between 31 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 259 into our formula, we get:
(31 + 259)/2 = 145
Thus, the number halfway between 31 and 259 is 145.
To check that our answer is correct, we subtract 31 from 145 and subtract 145 from 259 and compare the two numbers:
145 - 31 = 114
259 - 145 = 114
As you can see, the halfway number is 114 higher than 31 and 114 lower than 259. Therefore, our halfway between answer of 145 above is correct.
Halfway Between
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Halfway Between 31 and 260
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