When you ask "What number is halfway between 100 and 403?" 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=403.
To find the number halfway between 100 and 403, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 403 into our formula, we get:
(100 + 403)/2 = 251.5
Thus, the number halfway between 100 and 403 is 251.5.
To check that our answer is correct, we subtract 100 from 251.5 and subtract 251.5 from 403 and compare the two numbers:
251.5 - 100 = 151.5
403 - 251.5 = 151.5
As you can see, the halfway number is 151.5 higher than 100 and 151.5 lower than 403. Therefore, our halfway between answer of 251.5 above is correct.
Halfway Between
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Halfway Between 100 and 404
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