When you ask "What number is halfway between 66 and 99?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=66 and Y=99.
To find the number halfway between 66 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 99 into our formula, we get:
(66 + 99)/2 = 82.5
Thus, the number halfway between 66 and 99 is 82.5.
To check that our answer is correct, we subtract 66 from 82.5 and subtract 82.5 from 99 and compare the two numbers:
82.5 - 66 = 16.5
99 - 82.5 = 16.5
As you can see, the halfway number is 16.5 higher than 66 and 16.5 lower than 99. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 66 and 100
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