
When you ask "What number is halfway between 12 and 542?" 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=542.

To find the number halfway between 12 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 542 into our formula, we get:
(12 + 542)/2 = 277
Thus, the number halfway between 12 and 542 is 277.
To check that our answer is correct, we subtract 12 from 277 and subtract 277 from 542 and compare the two numbers:
277 - 12 = 265
542 - 277 = 265
As you can see, the halfway number is 265 higher than 12 and 265 lower than 542. Therefore, our halfway between answer of 277 above is correct.
Halfway Between
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Halfway Between 12 and 543
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