When you ask "What number is halfway between 21 and 564?" 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=564.
To find the number halfway between 21 and 564, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 564 into our formula, we get:
(21 + 564)/2 = 292.5
Thus, the number halfway between 21 and 564 is 292.5.
To check that our answer is correct, we subtract 21 from 292.5 and subtract 292.5 from 564 and compare the two numbers:
292.5 - 21 = 271.5
564 - 292.5 = 271.5
As you can see, the halfway number is 271.5 higher than 21 and 271.5 lower than 564. Therefore, our halfway between answer of 292.5 above is correct.
Halfway Between
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Halfway Between 21 and 565
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