When you ask "What number is halfway between 20 and 273?" 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=273.
To find the number halfway between 20 and 273, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 273 into our formula, we get:
(20 + 273)/2 = 146.5
Thus, the number halfway between 20 and 273 is 146.5.
To check that our answer is correct, we subtract 20 from 146.5 and subtract 146.5 from 273 and compare the two numbers:
146.5 - 20 = 126.5
273 - 146.5 = 126.5
As you can see, the halfway number is 126.5 higher than 20 and 126.5 lower than 273. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 20 and 274
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