When you ask "What number is halfway between 100 and 417?" 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=417.
To find the number halfway between 100 and 417, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 417 into our formula, we get:
(100 + 417)/2 = 258.5
Thus, the number halfway between 100 and 417 is 258.5.
To check that our answer is correct, we subtract 100 from 258.5 and subtract 258.5 from 417 and compare the two numbers:
258.5 - 100 = 158.5
417 - 258.5 = 158.5
As you can see, the halfway number is 158.5 higher than 100 and 158.5 lower than 417. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 100 and 418
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