When you ask "What number is halfway between 21 and 566?" 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=566.
To find the number halfway between 21 and 566, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 566 into our formula, we get:
(21 + 566)/2 = 293.5
Thus, the number halfway between 21 and 566 is 293.5.
To check that our answer is correct, we subtract 21 from 293.5 and subtract 293.5 from 566 and compare the two numbers:
293.5 - 21 = 272.5
566 - 293.5 = 272.5
As you can see, the halfway number is 272.5 higher than 21 and 272.5 lower than 566. Therefore, our halfway between answer of 293.5 above is correct.
Halfway Between
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Halfway Between 21 and 567
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