When you ask "What number is halfway between 21 and 492?" 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=492.
To find the number halfway between 21 and 492, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 492 into our formula, we get:
(21 + 492)/2 = 256.5
Thus, the number halfway between 21 and 492 is 256.5.
To check that our answer is correct, we subtract 21 from 256.5 and subtract 256.5 from 492 and compare the two numbers:
256.5 - 21 = 235.5
492 - 256.5 = 235.5
As you can see, the halfway number is 235.5 higher than 21 and 235.5 lower than 492. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 21 and 493
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