When you ask "What number is halfway between 20 and 331?" 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=331.
To find the number halfway between 20 and 331, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 331 into our formula, we get:
(20 + 331)/2 = 175.5
Thus, the number halfway between 20 and 331 is 175.5.
To check that our answer is correct, we subtract 20 from 175.5 and subtract 175.5 from 331 and compare the two numbers:
175.5 - 20 = 155.5
331 - 175.5 = 155.5
As you can see, the halfway number is 155.5 higher than 20 and 155.5 lower than 331. Therefore, our halfway between answer of 175.5 above is correct.
Halfway Between
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Halfway Between 20 and 332
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