When you ask "What number is halfway between 100 and 781?" 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=781.
To find the number halfway between 100 and 781, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 781 into our formula, we get:
(100 + 781)/2 = 440.5
Thus, the number halfway between 100 and 781 is 440.5.
To check that our answer is correct, we subtract 100 from 440.5 and subtract 440.5 from 781 and compare the two numbers:
440.5 - 100 = 340.5
781 - 440.5 = 340.5
As you can see, the halfway number is 340.5 higher than 100 and 340.5 lower than 781. Therefore, our halfway between answer of 440.5 above is correct.
Halfway Between
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Halfway Between 100 and 782
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