When you ask "What number is halfway between 100 and 563?" 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=563.
To find the number halfway between 100 and 563, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 563 into our formula, we get:
(100 + 563)/2 = 331.5
Thus, the number halfway between 100 and 563 is 331.5.
To check that our answer is correct, we subtract 100 from 331.5 and subtract 331.5 from 563 and compare the two numbers:
331.5 - 100 = 231.5
563 - 331.5 = 231.5
As you can see, the halfway number is 231.5 higher than 100 and 231.5 lower than 563. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 100 and 564
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