When you ask "What number is halfway between 20 and 457?" 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=457.
To find the number halfway between 20 and 457, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 457 into our formula, we get:
(20 + 457)/2 = 238.5
Thus, the number halfway between 20 and 457 is 238.5.
To check that our answer is correct, we subtract 20 from 238.5 and subtract 238.5 from 457 and compare the two numbers:
238.5 - 20 = 218.5
457 - 238.5 = 218.5
As you can see, the halfway number is 218.5 higher than 20 and 218.5 lower than 457. Therefore, our halfway between answer of 238.5 above is correct.
Halfway Between
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Halfway Between 20 and 458
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