When you ask "What number is halfway between 21 and 574?" 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=574.
To find the number halfway between 21 and 574, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 574 into our formula, we get:
(21 + 574)/2 = 297.5
Thus, the number halfway between 21 and 574 is 297.5.
To check that our answer is correct, we subtract 21 from 297.5 and subtract 297.5 from 574 and compare the two numbers:
297.5 - 21 = 276.5
574 - 297.5 = 276.5
As you can see, the halfway number is 276.5 higher than 21 and 276.5 lower than 574. Therefore, our halfway between answer of 297.5 above is correct.
Halfway Between
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Halfway Between 21 and 575
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