When you ask "What number is halfway between 20 and 319?" 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=319.
To find the number halfway between 20 and 319, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 319 into our formula, we get:
(20 + 319)/2 = 169.5
Thus, the number halfway between 20 and 319 is 169.5.
To check that our answer is correct, we subtract 20 from 169.5 and subtract 169.5 from 319 and compare the two numbers:
169.5 - 20 = 149.5
319 - 169.5 = 149.5
As you can see, the halfway number is 149.5 higher than 20 and 149.5 lower than 319. Therefore, our halfway between answer of 169.5 above is correct.
Halfway Between
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Halfway Between 20 and 320
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