When you ask "What number is halfway between 20 and 579?" 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=579.
To find the number halfway between 20 and 579, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 579 into our formula, we get:
(20 + 579)/2 = 299.5
Thus, the number halfway between 20 and 579 is 299.5.
To check that our answer is correct, we subtract 20 from 299.5 and subtract 299.5 from 579 and compare the two numbers:
299.5 - 20 = 279.5
579 - 299.5 = 279.5
As you can see, the halfway number is 279.5 higher than 20 and 279.5 lower than 579. Therefore, our halfway between answer of 299.5 above is correct.
Halfway Between
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Halfway Between 20 and 580
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