When you ask "What number is halfway between 21 and 655?" 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=655.
To find the number halfway between 21 and 655, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 655 into our formula, we get:
(21 + 655)/2 = 338
Thus, the number halfway between 21 and 655 is 338.
To check that our answer is correct, we subtract 21 from 338 and subtract 338 from 655 and compare the two numbers:
338 - 21 = 317
655 - 338 = 317
As you can see, the halfway number is 317 higher than 21 and 317 lower than 655. Therefore, our halfway between answer of 338 above is correct.
Halfway Between
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Halfway Between 21 and 656
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