When you ask "What number is halfway between 21 and 697?" 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=697.
To find the number halfway between 21 and 697, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 697 into our formula, we get:
(21 + 697)/2 = 359
Thus, the number halfway between 21 and 697 is 359.
To check that our answer is correct, we subtract 21 from 359 and subtract 359 from 697 and compare the two numbers:
359 - 21 = 338
697 - 359 = 338
As you can see, the halfway number is 338 higher than 21 and 338 lower than 697. Therefore, our halfway between answer of 359 above is correct.
Halfway Between
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Halfway Between 21 and 698
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