When you ask "What number is halfway between 21 and 789?" 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=789.
To find the number halfway between 21 and 789, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 789 into our formula, we get:
(21 + 789)/2 = 405
Thus, the number halfway between 21 and 789 is 405.
To check that our answer is correct, we subtract 21 from 405 and subtract 405 from 789 and compare the two numbers:
405 - 21 = 384
789 - 405 = 384
As you can see, the halfway number is 384 higher than 21 and 384 lower than 789. Therefore, our halfway between answer of 405 above is correct.
Halfway Between
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Halfway Between 21 and 790
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