When you ask "What number is halfway between 20 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=20 and Y=82.
To find the number halfway between 20 and 82, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 82 into our formula, we get:
(20 + 82)/2 = 51
Thus, the number halfway between 20 and 82 is 51.
To check that our answer is correct, we subtract 20 from 51 and subtract 51 from 82 and compare the two numbers:
51 - 20 = 31
82 - 51 = 31
As you can see, the halfway number is 31 higher than 20 and 31 lower than 82. Therefore, our halfway between answer of 51 above is correct.
Halfway Between
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Halfway Between 20 and 83
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