When you ask "What number is halfway between 87 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=87 and Y=720.
To find the number halfway between 87 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 720 into our formula, we get:
(87 + 720)/2 = 403.5
Thus, the number halfway between 87 and 720 is 403.5.
To check that our answer is correct, we subtract 87 from 403.5 and subtract 403.5 from 720 and compare the two numbers:
403.5 - 87 = 316.5
720 - 403.5 = 316.5
As you can see, the halfway number is 316.5 higher than 87 and 316.5 lower than 720. Therefore, our halfway between answer of 403.5 above is correct.
Halfway Between
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