When you ask "What number is halfway between 9 and 66?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=66.
To find the number halfway between 9 and 66, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 66 into our formula, we get:
(9 + 66)/2 = 37.5
Thus, the number halfway between 9 and 66 is 37.5.
To check that our answer is correct, we subtract 9 from 37.5 and subtract 37.5 from 66 and compare the two numbers:
37.5 - 9 = 28.5
66 - 37.5 = 28.5
As you can see, the halfway number is 28.5 higher than 9 and 28.5 lower than 66. Therefore, our halfway between answer of 37.5 above is correct.
Halfway Between
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Halfway Between 9 and 67
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