When you ask "What number is halfway between 99 and 666?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=666.
To find the number halfway between 99 and 666, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 666 into our formula, we get:
(99 + 666)/2 = 382.5
Thus, the number halfway between 99 and 666 is 382.5.
To check that our answer is correct, we subtract 99 from 382.5 and subtract 382.5 from 666 and compare the two numbers:
382.5 - 99 = 283.5
666 - 382.5 = 283.5
As you can see, the halfway number is 283.5 higher than 99 and 283.5 lower than 666. Therefore, our halfway between answer of 382.5 above is correct.
Halfway Between
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Halfway Between 99 and 667
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