When you ask "What number is halfway between 21 and 877?" 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=877.
To find the number halfway between 21 and 877, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 877 into our formula, we get:
(21 + 877)/2 = 449
Thus, the number halfway between 21 and 877 is 449.
To check that our answer is correct, we subtract 21 from 449 and subtract 449 from 877 and compare the two numbers:
449 - 21 = 428
877 - 449 = 428
As you can see, the halfway number is 428 higher than 21 and 428 lower than 877. Therefore, our halfway between answer of 449 above is correct.
Halfway Between
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Halfway Between 21 and 878
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