When you ask "What number is halfway between 20 and 497?" 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=497.
To find the number halfway between 20 and 497, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 497 into our formula, we get:
(20 + 497)/2 = 258.5
Thus, the number halfway between 20 and 497 is 258.5.
To check that our answer is correct, we subtract 20 from 258.5 and subtract 258.5 from 497 and compare the two numbers:
258.5 - 20 = 238.5
497 - 258.5 = 238.5
As you can see, the halfway number is 238.5 higher than 20 and 238.5 lower than 497. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 20 and 498
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