When you ask "What number is halfway between 21 and 891?" 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=891.
To find the number halfway between 21 and 891, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 891 into our formula, we get:
(21 + 891)/2 = 456
Thus, the number halfway between 21 and 891 is 456.
To check that our answer is correct, we subtract 21 from 456 and subtract 456 from 891 and compare the two numbers:
456 - 21 = 435
891 - 456 = 435
As you can see, the halfway number is 435 higher than 21 and 435 lower than 891. Therefore, our halfway between answer of 456 above is correct.
Halfway Between
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Halfway Between 21 and 892
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