When you ask "What number is halfway between 15 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=15 and Y=720.
To find the number halfway between 15 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 720 into our formula, we get:
(15 + 720)/2 = 367.5
Thus, the number halfway between 15 and 720 is 367.5.
To check that our answer is correct, we subtract 15 from 367.5 and subtract 367.5 from 720 and compare the two numbers:
367.5 - 15 = 352.5
720 - 367.5 = 352.5
As you can see, the halfway number is 352.5 higher than 15 and 352.5 lower than 720. Therefore, our halfway between answer of 367.5 above is correct.
Halfway Between
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Halfway Between 15 and 721
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