When you ask "What number is halfway between 20 and 271?" 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=271.
To find the number halfway between 20 and 271, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 271 into our formula, we get:
(20 + 271)/2 = 145.5
Thus, the number halfway between 20 and 271 is 145.5.
To check that our answer is correct, we subtract 20 from 145.5 and subtract 145.5 from 271 and compare the two numbers:
145.5 - 20 = 125.5
271 - 145.5 = 125.5
As you can see, the halfway number is 125.5 higher than 20 and 125.5 lower than 271. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 20 and 272
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