When you ask "What number is halfway between 21 and 504?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=504.
To find the number halfway between 21 and 504, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 504 into our formula, we get:
(21 + 504)/2 = 262.5
Thus, the number halfway between 21 and 504 is 262.5.
To check that our answer is correct, we subtract 21 from 262.5 and subtract 262.5 from 504 and compare the two numbers:
262.5 - 21 = 241.5
504 - 262.5 = 241.5
As you can see, the halfway number is 241.5 higher than 21 and 241.5 lower than 504. Therefore, our halfway between answer of 262.5 above is correct.
Halfway Between
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Halfway Between 21 and 505
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