When you ask "What number is halfway between 12 and 275?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=275.
To find the number halfway between 12 and 275, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 275 into our formula, we get:
(12 + 275)/2 = 143.5
Thus, the number halfway between 12 and 275 is 143.5.
To check that our answer is correct, we subtract 12 from 143.5 and subtract 143.5 from 275 and compare the two numbers:
143.5 - 12 = 131.5
275 - 143.5 = 131.5
As you can see, the halfway number is 131.5 higher than 12 and 131.5 lower than 275. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 12 and 276
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