
When you ask "What number is halfway between 20 and 355?" 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=355.

To find the number halfway between 20 and 355, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 355 into our formula, we get:
(20 + 355)/2 = 187.5
Thus, the number halfway between 20 and 355 is 187.5.
To check that our answer is correct, we subtract 20 from 187.5 and subtract 187.5 from 355 and compare the two numbers:
187.5 - 20 = 167.5
355 - 187.5 = 167.5
As you can see, the halfway number is 167.5 higher than 20 and 167.5 lower than 355. Therefore, our halfway between answer of 187.5 above is correct.
Halfway Between
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Halfway Between 20 and 356
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