When you ask "What number is halfway between 21 and 605?" 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=605.
To find the number halfway between 21 and 605, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 605 into our formula, we get:
(21 + 605)/2 = 313
Thus, the number halfway between 21 and 605 is 313.
To check that our answer is correct, we subtract 21 from 313 and subtract 313 from 605 and compare the two numbers:
313 - 21 = 292
605 - 313 = 292
As you can see, the halfway number is 292 higher than 21 and 292 lower than 605. Therefore, our halfway between answer of 313 above is correct.
Halfway Between
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Halfway Between 21 and 606
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