When you ask "What number is halfway between 21 and 718?" 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=718.
To find the number halfway between 21 and 718, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 718 into our formula, we get:
(21 + 718)/2 = 369.5
Thus, the number halfway between 21 and 718 is 369.5.
To check that our answer is correct, we subtract 21 from 369.5 and subtract 369.5 from 718 and compare the two numbers:
369.5 - 21 = 348.5
718 - 369.5 = 348.5
As you can see, the halfway number is 348.5 higher than 21 and 348.5 lower than 718. Therefore, our halfway between answer of 369.5 above is correct.
Halfway Between
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Halfway Between 21 and 719
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