When you ask "What number is halfway between 100 and 411?" 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=411.
To find the number halfway between 100 and 411, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 411 into our formula, we get:
(100 + 411)/2 = 255.5
Thus, the number halfway between 100 and 411 is 255.5.
To check that our answer is correct, we subtract 100 from 255.5 and subtract 255.5 from 411 and compare the two numbers:
255.5 - 100 = 155.5
411 - 255.5 = 155.5
As you can see, the halfway number is 155.5 higher than 100 and 155.5 lower than 411. Therefore, our halfway between answer of 255.5 above is correct.
Halfway Between
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Halfway Between 100 and 412
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