When you ask "What number is halfway between 31 and 254?" 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=254.
To find the number halfway between 31 and 254, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 254 into our formula, we get:
(31 + 254)/2 = 142.5
Thus, the number halfway between 31 and 254 is 142.5.
To check that our answer is correct, we subtract 31 from 142.5 and subtract 142.5 from 254 and compare the two numbers:
142.5 - 31 = 111.5
254 - 142.5 = 111.5
As you can see, the halfway number is 111.5 higher than 31 and 111.5 lower than 254. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 31 and 255
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