When you ask "What number is halfway between 100 and 813?" 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=813.
To find the number halfway between 100 and 813, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 813 into our formula, we get:
(100 + 813)/2 = 456.5
Thus, the number halfway between 100 and 813 is 456.5.
To check that our answer is correct, we subtract 100 from 456.5 and subtract 456.5 from 813 and compare the two numbers:
456.5 - 100 = 356.5
813 - 456.5 = 356.5
As you can see, the halfway number is 356.5 higher than 100 and 356.5 lower than 813. Therefore, our halfway between answer of 456.5 above is correct.
Halfway Between
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Halfway Between 100 and 814
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