When you ask "What number is halfway between 100 and 331?" 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=331.
To find the number halfway between 100 and 331, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 331 into our formula, we get:
(100 + 331)/2 = 215.5
Thus, the number halfway between 100 and 331 is 215.5.
To check that our answer is correct, we subtract 100 from 215.5 and subtract 215.5 from 331 and compare the two numbers:
215.5 - 100 = 115.5
331 - 215.5 = 115.5
As you can see, the halfway number is 115.5 higher than 100 and 115.5 lower than 331. Therefore, our halfway between answer of 215.5 above is correct.
Halfway Between
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Halfway Between 100 and 332
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