When you ask "What number is halfway between 100 and 415?" 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=415.
To find the number halfway between 100 and 415, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 415 into our formula, we get:
(100 + 415)/2 = 257.5
Thus, the number halfway between 100 and 415 is 257.5.
To check that our answer is correct, we subtract 100 from 257.5 and subtract 257.5 from 415 and compare the two numbers:
257.5 - 100 = 157.5
415 - 257.5 = 157.5
As you can see, the halfway number is 157.5 higher than 100 and 157.5 lower than 415. Therefore, our halfway between answer of 257.5 above is correct.
Halfway Between
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Halfway Between 100 and 416
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