When you ask "What number is halfway between 21 and 771?" 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=771.
To find the number halfway between 21 and 771, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 771 into our formula, we get:
(21 + 771)/2 = 396
Thus, the number halfway between 21 and 771 is 396.
To check that our answer is correct, we subtract 21 from 396 and subtract 396 from 771 and compare the two numbers:
396 - 21 = 375
771 - 396 = 375
As you can see, the halfway number is 375 higher than 21 and 375 lower than 771. Therefore, our halfway between answer of 396 above is correct.
Halfway Between
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Halfway Between 21 and 772
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