When you ask "What number is halfway between 100 and 771?" 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=771.
To find the number halfway between 100 and 771, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 771 into our formula, we get:
(100 + 771)/2 = 435.5
Thus, the number halfway between 100 and 771 is 435.5.
To check that our answer is correct, we subtract 100 from 435.5 and subtract 435.5 from 771 and compare the two numbers:
435.5 - 100 = 335.5
771 - 435.5 = 335.5
As you can see, the halfway number is 335.5 higher than 100 and 335.5 lower than 771. Therefore, our halfway between answer of 435.5 above is correct.
Halfway Between
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Halfway Between 100 and 772
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