When you ask "What number is halfway between 20 and 781?" 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=781.
To find the number halfway between 20 and 781, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 781 into our formula, we get:
(20 + 781)/2 = 400.5
Thus, the number halfway between 20 and 781 is 400.5.
To check that our answer is correct, we subtract 20 from 400.5 and subtract 400.5 from 781 and compare the two numbers:
400.5 - 20 = 380.5
781 - 400.5 = 380.5
As you can see, the halfway number is 380.5 higher than 20 and 380.5 lower than 781. Therefore, our halfway between answer of 400.5 above is correct.
Halfway Between
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Halfway Between 20 and 782
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