When you ask "What number is halfway between 20 and 209?" 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=209.
To find the number halfway between 20 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 209 into our formula, we get:
(20 + 209)/2 = 114.5
Thus, the number halfway between 20 and 209 is 114.5.
To check that our answer is correct, we subtract 20 from 114.5 and subtract 114.5 from 209 and compare the two numbers:
114.5 - 20 = 94.5
209 - 114.5 = 94.5
As you can see, the halfway number is 94.5 higher than 20 and 94.5 lower than 209. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 20 and 210
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