When you ask "What number is halfway between 15 and 240?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=240.
To find the number halfway between 15 and 240, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 240 into our formula, we get:
(15 + 240)/2 = 127.5
Thus, the number halfway between 15 and 240 is 127.5.
To check that our answer is correct, we subtract 15 from 127.5 and subtract 127.5 from 240 and compare the two numbers:
127.5 - 15 = 112.5
240 - 127.5 = 112.5
As you can see, the halfway number is 112.5 higher than 15 and 112.5 lower than 240. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 15 and 241
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