When you ask "What number is halfway between 12 and 455?" 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=455.
To find the number halfway between 12 and 455, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 455 into our formula, we get:
(12 + 455)/2 = 233.5
Thus, the number halfway between 12 and 455 is 233.5.
To check that our answer is correct, we subtract 12 from 233.5 and subtract 233.5 from 455 and compare the two numbers:
233.5 - 12 = 221.5
455 - 233.5 = 221.5
As you can see, the halfway number is 221.5 higher than 12 and 221.5 lower than 455. Therefore, our halfway between answer of 233.5 above is correct.
Halfway Between
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Halfway Between 12 and 456
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