When you ask "What number is halfway between 21 and 572?" 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=572.
To find the number halfway between 21 and 572, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 572 into our formula, we get:
(21 + 572)/2 = 296.5
Thus, the number halfway between 21 and 572 is 296.5.
To check that our answer is correct, we subtract 21 from 296.5 and subtract 296.5 from 572 and compare the two numbers:
296.5 - 21 = 275.5
572 - 296.5 = 275.5
As you can see, the halfway number is 275.5 higher than 21 and 275.5 lower than 572. Therefore, our halfway between answer of 296.5 above is correct.
Halfway Between
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Halfway Between 21 and 573
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