When you ask "What number is halfway between 20 and 779?" 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=779.
To find the number halfway between 20 and 779, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 779 into our formula, we get:
(20 + 779)/2 = 399.5
Thus, the number halfway between 20 and 779 is 399.5.
To check that our answer is correct, we subtract 20 from 399.5 and subtract 399.5 from 779 and compare the two numbers:
399.5 - 20 = 379.5
779 - 399.5 = 379.5
As you can see, the halfway number is 379.5 higher than 20 and 379.5 lower than 779. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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Halfway Between 20 and 780
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