When you ask "What number is halfway between 82 and 640?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=82 and Y=640.
To find the number halfway between 82 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 82 and 640 into our formula, we get:
(82 + 640)/2 = 361
Thus, the number halfway between 82 and 640 is 361.
To check that our answer is correct, we subtract 82 from 361 and subtract 361 from 640 and compare the two numbers:
361 - 82 = 279
640 - 361 = 279
As you can see, the halfway number is 279 higher than 82 and 279 lower than 640. Therefore, our halfway between answer of 361 above is correct.
Halfway Between
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