When you ask "What number is halfway between 20 and 275?" 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=275.
To find the number halfway between 20 and 275, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 275 into our formula, we get:
(20 + 275)/2 = 147.5
Thus, the number halfway between 20 and 275 is 147.5.
To check that our answer is correct, we subtract 20 from 147.5 and subtract 147.5 from 275 and compare the two numbers:
147.5 - 20 = 127.5
275 - 147.5 = 127.5
As you can see, the halfway number is 127.5 higher than 20 and 127.5 lower than 275. Therefore, our halfway between answer of 147.5 above is correct.
Halfway Between
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Halfway Between 20 and 276
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