When you ask "What number is halfway between 21 and 330?" 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=330.
To find the number halfway between 21 and 330, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 330 into our formula, we get:
(21 + 330)/2 = 175.5
Thus, the number halfway between 21 and 330 is 175.5.
To check that our answer is correct, we subtract 21 from 175.5 and subtract 175.5 from 330 and compare the two numbers:
175.5 - 21 = 154.5
330 - 175.5 = 154.5
As you can see, the halfway number is 154.5 higher than 21 and 154.5 lower than 330. Therefore, our halfway between answer of 175.5 above is correct.
Halfway Between
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Halfway Between 21 and 331
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