When you ask "What number is halfway between 20 and 239?" 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=239.
To find the number halfway between 20 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 239 into our formula, we get:
(20 + 239)/2 = 129.5
Thus, the number halfway between 20 and 239 is 129.5.
To check that our answer is correct, we subtract 20 from 129.5 and subtract 129.5 from 239 and compare the two numbers:
129.5 - 20 = 109.5
239 - 129.5 = 109.5
As you can see, the halfway number is 109.5 higher than 20 and 109.5 lower than 239. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 20 and 240
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