When you ask "What number is halfway between 66 and 91?" 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=91.
To find the number halfway between 66 and 91, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 91 into our formula, we get:
(66 + 91)/2 = 78.5
Thus, the number halfway between 66 and 91 is 78.5.
To check that our answer is correct, we subtract 66 from 78.5 and subtract 78.5 from 91 and compare the two numbers:
78.5 - 66 = 12.5
91 - 78.5 = 12.5
As you can see, the halfway number is 12.5 higher than 66 and 12.5 lower than 91. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 66 and 92
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