
When you ask "What number is halfway between 100 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=100 and Y=877.

To find the number halfway between 100 and 877, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 877 into our formula, we get:
(100 + 877)/2 = 488.5
Thus, the number halfway between 100 and 877 is 488.5.
To check that our answer is correct, we subtract 100 from 488.5 and subtract 488.5 from 877 and compare the two numbers:
488.5 - 100 = 388.5
877 - 488.5 = 388.5
As you can see, the halfway number is 388.5 higher than 100 and 388.5 lower than 877. Therefore, our halfway between answer of 488.5 above is correct.
Halfway Between
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Halfway Between 100 and 878
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