When you ask "What number is halfway between 18 and 331?" 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=331.
To find the number halfway between 18 and 331, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 331 into our formula, we get:
(18 + 331)/2 = 174.5
Thus, the number halfway between 18 and 331 is 174.5.
To check that our answer is correct, we subtract 18 from 174.5 and subtract 174.5 from 331 and compare the two numbers:
174.5 - 18 = 156.5
331 - 174.5 = 156.5
As you can see, the halfway number is 156.5 higher than 18 and 156.5 lower than 331. Therefore, our halfway between answer of 174.5 above is correct.
Halfway Between
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Halfway Between 18 and 332
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