When you ask "What number is halfway between 12 and 278?" 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=278.
To find the number halfway between 12 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 278 into our formula, we get:
(12 + 278)/2 = 145
Thus, the number halfway between 12 and 278 is 145.
To check that our answer is correct, we subtract 12 from 145 and subtract 145 from 278 and compare the two numbers:
145 - 12 = 133
278 - 145 = 133
As you can see, the halfway number is 133 higher than 12 and 133 lower than 278. Therefore, our halfway between answer of 145 above is correct.
Halfway Between
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Halfway Between 12 and 279
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