When you ask "What number is halfway between 100 and 857?" 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=857.
To find the number halfway between 100 and 857, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 857 into our formula, we get:
(100 + 857)/2 = 478.5
Thus, the number halfway between 100 and 857 is 478.5.
To check that our answer is correct, we subtract 100 from 478.5 and subtract 478.5 from 857 and compare the two numbers:
478.5 - 100 = 378.5
857 - 478.5 = 378.5
As you can see, the halfway number is 378.5 higher than 100 and 378.5 lower than 857. Therefore, our halfway between answer of 478.5 above is correct.
Halfway Between
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Halfway Between 100 and 858
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