When you ask "What number is halfway between 12 and 649?" 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=649.
To find the number halfway between 12 and 649, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 649 into our formula, we get:
(12 + 649)/2 = 330.5
Thus, the number halfway between 12 and 649 is 330.5.
To check that our answer is correct, we subtract 12 from 330.5 and subtract 330.5 from 649 and compare the two numbers:
330.5 - 12 = 318.5
649 - 330.5 = 318.5
As you can see, the halfway number is 318.5 higher than 12 and 318.5 lower than 649. Therefore, our halfway between answer of 330.5 above is correct.
Halfway Between
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Halfway Between 12 and 650
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