When you ask "What number is halfway between 20 and 203?" 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=203.
To find the number halfway between 20 and 203, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 203 into our formula, we get:
(20 + 203)/2 = 111.5
Thus, the number halfway between 20 and 203 is 111.5.
To check that our answer is correct, we subtract 20 from 111.5 and subtract 111.5 from 203 and compare the two numbers:
111.5 - 20 = 91.5
203 - 111.5 = 91.5
As you can see, the halfway number is 91.5 higher than 20 and 91.5 lower than 203. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 20 and 204
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