When you ask "What number is halfway between 31 and 266?" 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=266.
To find the number halfway between 31 and 266, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 266 into our formula, we get:
(31 + 266)/2 = 148.5
Thus, the number halfway between 31 and 266 is 148.5.
To check that our answer is correct, we subtract 31 from 148.5 and subtract 148.5 from 266 and compare the two numbers:
148.5 - 31 = 117.5
266 - 148.5 = 117.5
As you can see, the halfway number is 117.5 higher than 31 and 117.5 lower than 266. Therefore, our halfway between answer of 148.5 above is correct.
Halfway Between
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Halfway Between 31 and 267
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