When you ask "What number is halfway between 12 and 665?" 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=665.
To find the number halfway between 12 and 665, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 665 into our formula, we get:
(12 + 665)/2 = 338.5
Thus, the number halfway between 12 and 665 is 338.5.
To check that our answer is correct, we subtract 12 from 338.5 and subtract 338.5 from 665 and compare the two numbers:
338.5 - 12 = 326.5
665 - 338.5 = 326.5
As you can see, the halfway number is 326.5 higher than 12 and 326.5 lower than 665. Therefore, our halfway between answer of 338.5 above is correct.
Halfway Between
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Halfway Between 12 and 666
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