When you ask "What number is halfway between 18 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=18 and Y=240.
To find the number halfway between 18 and 240, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 240 into our formula, we get:
(18 + 240)/2 = 129
Thus, the number halfway between 18 and 240 is 129.
To check that our answer is correct, we subtract 18 from 129 and subtract 129 from 240 and compare the two numbers:
129 - 18 = 111
240 - 129 = 111
As you can see, the halfway number is 111 higher than 18 and 111 lower than 240. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
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Halfway Between 18 and 241
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