When you ask "What number is halfway between 21 and 690?" 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=690.
To find the number halfway between 21 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 690 into our formula, we get:
(21 + 690)/2 = 355.5
Thus, the number halfway between 21 and 690 is 355.5.
To check that our answer is correct, we subtract 21 from 355.5 and subtract 355.5 from 690 and compare the two numbers:
355.5 - 21 = 334.5
690 - 355.5 = 334.5
As you can see, the halfway number is 334.5 higher than 21 and 334.5 lower than 690. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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Halfway Between 21 and 691
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