When you ask "What number is halfway between 20 and 265?" 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=265.
To find the number halfway between 20 and 265, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 265 into our formula, we get:
(20 + 265)/2 = 142.5
Thus, the number halfway between 20 and 265 is 142.5.
To check that our answer is correct, we subtract 20 from 142.5 and subtract 142.5 from 265 and compare the two numbers:
142.5 - 20 = 122.5
265 - 142.5 = 122.5
As you can see, the halfway number is 122.5 higher than 20 and 122.5 lower than 265. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 20 and 266
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