
When you ask "What number is halfway between 20 and 659?" 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=659.

To find the number halfway between 20 and 659, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 659 into our formula, we get:
(20 + 659)/2 = 339.5
Thus, the number halfway between 20 and 659 is 339.5.
To check that our answer is correct, we subtract 20 from 339.5 and subtract 339.5 from 659 and compare the two numbers:
339.5 - 20 = 319.5
659 - 339.5 = 319.5
As you can see, the halfway number is 319.5 higher than 20 and 319.5 lower than 659. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 20 and 660
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