When you ask "What number is halfway between 100 and 889?" 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=889.
To find the number halfway between 100 and 889, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 889 into our formula, we get:
(100 + 889)/2 = 494.5
Thus, the number halfway between 100 and 889 is 494.5.
To check that our answer is correct, we subtract 100 from 494.5 and subtract 494.5 from 889 and compare the two numbers:
494.5 - 100 = 394.5
889 - 494.5 = 394.5
As you can see, the halfway number is 394.5 higher than 100 and 394.5 lower than 889. Therefore, our halfway between answer of 494.5 above is correct.
Halfway Between
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Halfway Between 100 and 890
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