
When you ask "What number is halfway between 47 and 242?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=47 and Y=242.

To find the number halfway between 47 and 242, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 47 and 242 into our formula, we get:
(47 + 242)/2 = 144.5
Thus, the number halfway between 47 and 242 is 144.5.
To check that our answer is correct, we subtract 47 from 144.5 and subtract 144.5 from 242 and compare the two numbers:
144.5 - 47 = 97.5
242 - 144.5 = 97.5
As you can see, the halfway number is 97.5 higher than 47 and 97.5 lower than 242. Therefore, our halfway between answer of 144.5 above is correct.
Halfway Between
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Halfway Between 47 and 243
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