When you ask "What number is halfway between 31 and 247?" 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=247.
To find the number halfway between 31 and 247, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 247 into our formula, we get:
(31 + 247)/2 = 139
Thus, the number halfway between 31 and 247 is 139.
To check that our answer is correct, we subtract 31 from 139 and subtract 139 from 247 and compare the two numbers:
139 - 31 = 108
247 - 139 = 108
As you can see, the halfway number is 108 higher than 31 and 108 lower than 247. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 31 and 248
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