When you ask "What number is halfway between 12 and 555?" 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=555.
To find the number halfway between 12 and 555, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 555 into our formula, we get:
(12 + 555)/2 = 283.5
Thus, the number halfway between 12 and 555 is 283.5.
To check that our answer is correct, we subtract 12 from 283.5 and subtract 283.5 from 555 and compare the two numbers:
283.5 - 12 = 271.5
555 - 283.5 = 271.5
As you can see, the halfway number is 271.5 higher than 12 and 271.5 lower than 555. Therefore, our halfway between answer of 283.5 above is correct.
Halfway Between
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Halfway Between 12 and 556
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