When you ask "What number is halfway between 20 and 163?" 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=163.
To find the number halfway between 20 and 163, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 163 into our formula, we get:
(20 + 163)/2 = 91.5
Thus, the number halfway between 20 and 163 is 91.5.
To check that our answer is correct, we subtract 20 from 91.5 and subtract 91.5 from 163 and compare the two numbers:
91.5 - 20 = 71.5
163 - 91.5 = 71.5
As you can see, the halfway number is 71.5 higher than 20 and 71.5 lower than 163. Therefore, our halfway between answer of 91.5 above is correct.
Halfway Between
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Halfway Between 20 and 164
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