When you ask "What number is halfway between 77 and 720?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=77 and Y=720.
To find the number halfway between 77 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 720 into our formula, we get:
(77 + 720)/2 = 398.5
Thus, the number halfway between 77 and 720 is 398.5.
To check that our answer is correct, we subtract 77 from 398.5 and subtract 398.5 from 720 and compare the two numbers:
398.5 - 77 = 321.5
720 - 398.5 = 321.5
As you can see, the halfway number is 321.5 higher than 77 and 321.5 lower than 720. Therefore, our halfway between answer of 398.5 above is correct.
Halfway Between
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