When you ask "What number is halfway between 9 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=9 and Y=720.
To find the number halfway between 9 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 720 into our formula, we get:
(9 + 720)/2 = 364.5
Thus, the number halfway between 9 and 720 is 364.5.
To check that our answer is correct, we subtract 9 from 364.5 and subtract 364.5 from 720 and compare the two numbers:
364.5 - 9 = 355.5
720 - 364.5 = 355.5
As you can see, the halfway number is 355.5 higher than 9 and 355.5 lower than 720. Therefore, our halfway between answer of 364.5 above is correct.
Halfway Between
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