When you ask "What number is halfway between 21 and 717?" 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=717.
To find the number halfway between 21 and 717, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 717 into our formula, we get:
(21 + 717)/2 = 369
Thus, the number halfway between 21 and 717 is 369.
To check that our answer is correct, we subtract 21 from 369 and subtract 369 from 717 and compare the two numbers:
369 - 21 = 348
717 - 369 = 348
As you can see, the halfway number is 348 higher than 21 and 348 lower than 717. Therefore, our halfway between answer of 369 above is correct.
Halfway Between
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Halfway Between 21 and 718
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