When you ask "What number is halfway between 21 and 528?" 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=528.
To find the number halfway between 21 and 528, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 528 into our formula, we get:
(21 + 528)/2 = 274.5
Thus, the number halfway between 21 and 528 is 274.5.
To check that our answer is correct, we subtract 21 from 274.5 and subtract 274.5 from 528 and compare the two numbers:
274.5 - 21 = 253.5
528 - 274.5 = 253.5
As you can see, the halfway number is 253.5 higher than 21 and 253.5 lower than 528. Therefore, our halfway between answer of 274.5 above is correct.
Halfway Between
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Halfway Between 21 and 529
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