When you ask "What number is halfway between 21 and 506?" 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=506.
To find the number halfway between 21 and 506, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 506 into our formula, we get:
(21 + 506)/2 = 263.5
Thus, the number halfway between 21 and 506 is 263.5.
To check that our answer is correct, we subtract 21 from 263.5 and subtract 263.5 from 506 and compare the two numbers:
263.5 - 21 = 242.5
506 - 263.5 = 242.5
As you can see, the halfway number is 242.5 higher than 21 and 242.5 lower than 506. Therefore, our halfway between answer of 263.5 above is correct.
Halfway Between
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Halfway Between 21 and 507
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