When you ask "What number is halfway between 20 and 493?" 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=493.
To find the number halfway between 20 and 493, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 493 into our formula, we get:
(20 + 493)/2 = 256.5
Thus, the number halfway between 20 and 493 is 256.5.
To check that our answer is correct, we subtract 20 from 256.5 and subtract 256.5 from 493 and compare the two numbers:
256.5 - 20 = 236.5
493 - 256.5 = 236.5
As you can see, the halfway number is 236.5 higher than 20 and 236.5 lower than 493. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 20 and 494
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