When you ask "What number is halfway between 21 and 880?" 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=880.
To find the number halfway between 21 and 880, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 880 into our formula, we get:
(21 + 880)/2 = 450.5
Thus, the number halfway between 21 and 880 is 450.5.
To check that our answer is correct, we subtract 21 from 450.5 and subtract 450.5 from 880 and compare the two numbers:
450.5 - 21 = 429.5
880 - 450.5 = 429.5
As you can see, the halfway number is 429.5 higher than 21 and 429.5 lower than 880. Therefore, our halfway between answer of 450.5 above is correct.
Halfway Between
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Halfway Between 21 and 881
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