
When you ask "What number is halfway between 20 and 206?" 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=206.

To find the number halfway between 20 and 206, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 206 into our formula, we get:
(20 + 206)/2 = 113
Thus, the number halfway between 20 and 206 is 113.
To check that our answer is correct, we subtract 20 from 113 and subtract 113 from 206 and compare the two numbers:
113 - 20 = 93
206 - 113 = 93
As you can see, the halfway number is 93 higher than 20 and 93 lower than 206. Therefore, our halfway between answer of 113 above is correct.
Halfway Between
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Halfway Between 20 and 207
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