When you ask "What number is halfway between 20 and 491?" 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=491.
To find the number halfway between 20 and 491, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 491 into our formula, we get:
(20 + 491)/2 = 255.5
Thus, the number halfway between 20 and 491 is 255.5.
To check that our answer is correct, we subtract 20 from 255.5 and subtract 255.5 from 491 and compare the two numbers:
255.5 - 20 = 235.5
491 - 255.5 = 235.5
As you can see, the halfway number is 235.5 higher than 20 and 235.5 lower than 491. Therefore, our halfway between answer of 255.5 above is correct.
Halfway Between
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Halfway Between 20 and 492
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