When you ask "What number is halfway between 21 and 876?" 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=876.
To find the number halfway between 21 and 876, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 876 into our formula, we get:
(21 + 876)/2 = 448.5
Thus, the number halfway between 21 and 876 is 448.5.
To check that our answer is correct, we subtract 21 from 448.5 and subtract 448.5 from 876 and compare the two numbers:
448.5 - 21 = 427.5
876 - 448.5 = 427.5
As you can see, the halfway number is 427.5 higher than 21 and 427.5 lower than 876. Therefore, our halfway between answer of 448.5 above is correct.
Halfway Between
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Halfway Between 21 and 877
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