When you ask "What number is halfway between 21 and 711?" 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=711.
To find the number halfway between 21 and 711, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 711 into our formula, we get:
(21 + 711)/2 = 366
Thus, the number halfway between 21 and 711 is 366.
To check that our answer is correct, we subtract 21 from 366 and subtract 366 from 711 and compare the two numbers:
366 - 21 = 345
711 - 366 = 345
As you can see, the halfway number is 345 higher than 21 and 345 lower than 711. Therefore, our halfway between answer of 366 above is correct.
Halfway Between
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Halfway Between 21 and 712
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