When you ask "What number is halfway between 21 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=21 and Y=497.
To find the number halfway between 21 and 497, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 497 into our formula, we get:
(21 + 497)/2 = 259
Thus, the number halfway between 21 and 497 is 259.
To check that our answer is correct, we subtract 21 from 259 and subtract 259 from 497 and compare the two numbers:
259 - 21 = 238
497 - 259 = 238
As you can see, the halfway number is 238 higher than 21 and 238 lower than 497. Therefore, our halfway between answer of 259 above is correct.
Halfway Between
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Halfway Between 21 and 498
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