When you ask "What number is halfway between 21 and 306?" 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=306.
To find the number halfway between 21 and 306, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 306 into our formula, we get:
(21 + 306)/2 = 163.5
Thus, the number halfway between 21 and 306 is 163.5.
To check that our answer is correct, we subtract 21 from 163.5 and subtract 163.5 from 306 and compare the two numbers:
163.5 - 21 = 142.5
306 - 163.5 = 142.5
As you can see, the halfway number is 142.5 higher than 21 and 142.5 lower than 306. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 21 and 307
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