When you ask "What number is halfway between 21 and 684?" 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=684.
To find the number halfway between 21 and 684, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 684 into our formula, we get:
(21 + 684)/2 = 352.5
Thus, the number halfway between 21 and 684 is 352.5.
To check that our answer is correct, we subtract 21 from 352.5 and subtract 352.5 from 684 and compare the two numbers:
352.5 - 21 = 331.5
684 - 352.5 = 331.5
As you can see, the halfway number is 331.5 higher than 21 and 331.5 lower than 684. Therefore, our halfway between answer of 352.5 above is correct.
Halfway Between
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Halfway Between 21 and 685
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