When you ask "What number is halfway between 21 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=21 and Y=720.
To find the number halfway between 21 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 720 into our formula, we get:
(21 + 720)/2 = 370.5
Thus, the number halfway between 21 and 720 is 370.5.
To check that our answer is correct, we subtract 21 from 370.5 and subtract 370.5 from 720 and compare the two numbers:
370.5 - 21 = 349.5
720 - 370.5 = 349.5
As you can see, the halfway number is 349.5 higher than 21 and 349.5 lower than 720. Therefore, our halfway between answer of 370.5 above is correct.
Halfway Between
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Halfway Between 21 and 721
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