When you ask "What number is halfway between 20 and 985?" 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=985.
To find the number halfway between 20 and 985, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 985 into our formula, we get:
(20 + 985)/2 = 502.5
Thus, the number halfway between 20 and 985 is 502.5.
To check that our answer is correct, we subtract 20 from 502.5 and subtract 502.5 from 985 and compare the two numbers:
502.5 - 20 = 482.5
985 - 502.5 = 482.5
As you can see, the halfway number is 482.5 higher than 20 and 482.5 lower than 985. Therefore, our halfway between answer of 502.5 above is correct.
Halfway Between
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Halfway Between 20 and 986
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