When you ask "What number is halfway between 100 and 501?" 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=501.
To find the number halfway between 100 and 501, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 501 into our formula, we get:
(100 + 501)/2 = 300.5
Thus, the number halfway between 100 and 501 is 300.5.
To check that our answer is correct, we subtract 100 from 300.5 and subtract 300.5 from 501 and compare the two numbers:
300.5 - 100 = 200.5
501 - 300.5 = 200.5
As you can see, the halfway number is 200.5 higher than 100 and 200.5 lower than 501. Therefore, our halfway between answer of 300.5 above is correct.
Halfway Between
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Halfway Between 100 and 502
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