When you ask "What number is halfway between 66 and 79?" 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=79.
To find the number halfway between 66 and 79, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 79 into our formula, we get:
(66 + 79)/2 = 72.5
Thus, the number halfway between 66 and 79 is 72.5.
To check that our answer is correct, we subtract 66 from 72.5 and subtract 72.5 from 79 and compare the two numbers:
72.5 - 66 = 6.5
79 - 72.5 = 6.5
As you can see, the halfway number is 6.5 higher than 66 and 6.5 lower than 79. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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