When you ask "What number is halfway between 100 and 311?" 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=311.
To find the number halfway between 100 and 311, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 311 into our formula, we get:
(100 + 311)/2 = 205.5
Thus, the number halfway between 100 and 311 is 205.5.
To check that our answer is correct, we subtract 100 from 205.5 and subtract 205.5 from 311 and compare the two numbers:
205.5 - 100 = 105.5
311 - 205.5 = 105.5
As you can see, the halfway number is 105.5 higher than 100 and 105.5 lower than 311. Therefore, our halfway between answer of 205.5 above is correct.
Halfway Between
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Halfway Between 100 and 312
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