When you ask "What number is halfway between 77 and 82?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=77 and Y=82.
To find the number halfway between 77 and 82, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 82 into our formula, we get:
(77 + 82)/2 = 79.5
Thus, the number halfway between 77 and 82 is 79.5.
To check that our answer is correct, we subtract 77 from 79.5 and subtract 79.5 from 82 and compare the two numbers:
79.5 - 77 = 2.5
82 - 79.5 = 2.5
As you can see, the halfway number is 2.5 higher than 77 and 2.5 lower than 82. Therefore, our halfway between answer of 79.5 above is correct.
Halfway Between
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Halfway Between 77 and 83
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