When you ask "What number is halfway between 21 and 872?" 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=872.
To find the number halfway between 21 and 872, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 872 into our formula, we get:
(21 + 872)/2 = 446.5
Thus, the number halfway between 21 and 872 is 446.5.
To check that our answer is correct, we subtract 21 from 446.5 and subtract 446.5 from 872 and compare the two numbers:
446.5 - 21 = 425.5
872 - 446.5 = 425.5
As you can see, the halfway number is 425.5 higher than 21 and 425.5 lower than 872. Therefore, our halfway between answer of 446.5 above is correct.
Halfway Between
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Halfway Between 21 and 873
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