When you ask "What number is halfway between 55 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=55 and Y=720.
To find the number halfway between 55 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 720 into our formula, we get:
(55 + 720)/2 = 387.5
Thus, the number halfway between 55 and 720 is 387.5.
To check that our answer is correct, we subtract 55 from 387.5 and subtract 387.5 from 720 and compare the two numbers:
387.5 - 55 = 332.5
720 - 387.5 = 332.5
As you can see, the halfway number is 332.5 higher than 55 and 332.5 lower than 720. Therefore, our halfway between answer of 387.5 above is correct.
Halfway Between
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