When you ask "What number is halfway between 100 and 873?" 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=873.
To find the number halfway between 100 and 873, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 873 into our formula, we get:
(100 + 873)/2 = 486.5
Thus, the number halfway between 100 and 873 is 486.5.
To check that our answer is correct, we subtract 100 from 486.5 and subtract 486.5 from 873 and compare the two numbers:
486.5 - 100 = 386.5
873 - 486.5 = 386.5
As you can see, the halfway number is 386.5 higher than 100 and 386.5 lower than 873. Therefore, our halfway between answer of 486.5 above is correct.
Halfway Between
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Halfway Between 100 and 874
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