When you ask "What number is halfway between 99 and 660?" 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=660.
To find the number halfway between 99 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 660 into our formula, we get:
(99 + 660)/2 = 379.5
Thus, the number halfway between 99 and 660 is 379.5.
To check that our answer is correct, we subtract 99 from 379.5 and subtract 379.5 from 660 and compare the two numbers:
379.5 - 99 = 280.5
660 - 379.5 = 280.5
As you can see, the halfway number is 280.5 higher than 99 and 280.5 lower than 660. Therefore, our halfway between answer of 379.5 above is correct.
Halfway Between
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