When you ask "What number is halfway between 20 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=20 and Y=415.
To find the number halfway between 20 and 415, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 415 into our formula, we get:
(20 + 415)/2 = 217.5
Thus, the number halfway between 20 and 415 is 217.5.
To check that our answer is correct, we subtract 20 from 217.5 and subtract 217.5 from 415 and compare the two numbers:
217.5 - 20 = 197.5
415 - 217.5 = 197.5
As you can see, the halfway number is 197.5 higher than 20 and 197.5 lower than 415. Therefore, our halfway between answer of 217.5 above is correct.
Halfway Between
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Halfway Between 20 and 416
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