When you ask "What number is halfway between 21 and 788?" 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=788.
To find the number halfway between 21 and 788, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 788 into our formula, we get:
(21 + 788)/2 = 404.5
Thus, the number halfway between 21 and 788 is 404.5.
To check that our answer is correct, we subtract 21 from 404.5 and subtract 404.5 from 788 and compare the two numbers:
404.5 - 21 = 383.5
788 - 404.5 = 383.5
As you can see, the halfway number is 383.5 higher than 21 and 383.5 lower than 788. Therefore, our halfway between answer of 404.5 above is correct.
Halfway Between
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