When you ask "What number is halfway between 12 and 661?" 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=661.
To find the number halfway between 12 and 661, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 661 into our formula, we get:
(12 + 661)/2 = 336.5
Thus, the number halfway between 12 and 661 is 336.5.
To check that our answer is correct, we subtract 12 from 336.5 and subtract 336.5 from 661 and compare the two numbers:
336.5 - 12 = 324.5
661 - 336.5 = 324.5
As you can see, the halfway number is 324.5 higher than 12 and 324.5 lower than 661. Therefore, our halfway between answer of 336.5 above is correct.
Halfway Between
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Halfway Between 12 and 662
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