When you ask "What number is halfway between 21 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=21 and Y=239.
To find the number halfway between 21 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 239 into our formula, we get:
(21 + 239)/2 = 130
Thus, the number halfway between 21 and 239 is 130.
To check that our answer is correct, we subtract 21 from 130 and subtract 130 from 239 and compare the two numbers:
130 - 21 = 109
239 - 130 = 109
As you can see, the halfway number is 109 higher than 21 and 109 lower than 239. Therefore, our halfway between answer of 130 above is correct.
Halfway Between
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Halfway Between 21 and 240
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