When you ask "What number is halfway between 21 and 305?" 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=305.
To find the number halfway between 21 and 305, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 305 into our formula, we get:
(21 + 305)/2 = 163
Thus, the number halfway between 21 and 305 is 163.
To check that our answer is correct, we subtract 21 from 163 and subtract 163 from 305 and compare the two numbers:
163 - 21 = 142
305 - 163 = 142
As you can see, the halfway number is 142 higher than 21 and 142 lower than 305. Therefore, our halfway between answer of 163 above is correct.
Halfway Between
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Halfway Between 21 and 306
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