When you ask "What number is halfway between 31 and 257?" 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=257.
To find the number halfway between 31 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 257 into our formula, we get:
(31 + 257)/2 = 144
Thus, the number halfway between 31 and 257 is 144.
To check that our answer is correct, we subtract 31 from 144 and subtract 144 from 257 and compare the two numbers:
144 - 31 = 113
257 - 144 = 113
As you can see, the halfway number is 113 higher than 31 and 113 lower than 257. Therefore, our halfway between answer of 144 above is correct.
Halfway Between
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Halfway Between 31 and 258
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