When you ask "What number is halfway between 21 and 530?" 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=530.
To find the number halfway between 21 and 530, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 530 into our formula, we get:
(21 + 530)/2 = 275.5
Thus, the number halfway between 21 and 530 is 275.5.
To check that our answer is correct, we subtract 21 from 275.5 and subtract 275.5 from 530 and compare the two numbers:
275.5 - 21 = 254.5
530 - 275.5 = 254.5
As you can see, the halfway number is 254.5 higher than 21 and 254.5 lower than 530. Therefore, our halfway between answer of 275.5 above is correct.
Halfway Between
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Halfway Between 21 and 531
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