When you ask "What number is halfway between 21 and 778?" 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=778.
To find the number halfway between 21 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 778 into our formula, we get:
(21 + 778)/2 = 399.5
Thus, the number halfway between 21 and 778 is 399.5.
To check that our answer is correct, we subtract 21 from 399.5 and subtract 399.5 from 778 and compare the two numbers:
399.5 - 21 = 378.5
778 - 399.5 = 378.5
As you can see, the halfway number is 378.5 higher than 21 and 378.5 lower than 778. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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Halfway Between 21 and 779
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