When you ask "What number is halfway between 21 and 770?" 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=770.
To find the number halfway between 21 and 770, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 770 into our formula, we get:
(21 + 770)/2 = 395.5
Thus, the number halfway between 21 and 770 is 395.5.
To check that our answer is correct, we subtract 21 from 395.5 and subtract 395.5 from 770 and compare the two numbers:
395.5 - 21 = 374.5
770 - 395.5 = 374.5
As you can see, the halfway number is 374.5 higher than 21 and 374.5 lower than 770. Therefore, our halfway between answer of 395.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 21 and 771
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