When you ask "What number is halfway between 21 and 645?" 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=645.
To find the number halfway between 21 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 645 into our formula, we get:
(21 + 645)/2 = 333
Thus, the number halfway between 21 and 645 is 333.
To check that our answer is correct, we subtract 21 from 333 and subtract 333 from 645 and compare the two numbers:
333 - 21 = 312
645 - 333 = 312
As you can see, the halfway number is 312 higher than 21 and 312 lower than 645. Therefore, our halfway between answer of 333 above is correct.
Halfway Between
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Halfway Between 21 and 646
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