When you ask "What number is halfway between 21 and 604?" 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=604.
To find the number halfway between 21 and 604, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 604 into our formula, we get:
(21 + 604)/2 = 312.5
Thus, the number halfway between 21 and 604 is 312.5.
To check that our answer is correct, we subtract 21 from 312.5 and subtract 312.5 from 604 and compare the two numbers:
312.5 - 21 = 291.5
604 - 312.5 = 291.5
As you can see, the halfway number is 291.5 higher than 21 and 291.5 lower than 604. Therefore, our halfway between answer of 312.5 above is correct.
Halfway Between
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Halfway Between 21 and 605
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