When you ask "What number is halfway between 21 and 560?" 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=560.
To find the number halfway between 21 and 560, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 560 into our formula, we get:
(21 + 560)/2 = 290.5
Thus, the number halfway between 21 and 560 is 290.5.
To check that our answer is correct, we subtract 21 from 290.5 and subtract 290.5 from 560 and compare the two numbers:
290.5 - 21 = 269.5
560 - 290.5 = 269.5
As you can see, the halfway number is 269.5 higher than 21 and 269.5 lower than 560. Therefore, our halfway between answer of 290.5 above is correct.
Halfway Between
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Halfway Between 21 and 561
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