When you ask "What number is halfway between 18 and 339?" 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=339.
To find the number halfway between 18 and 339, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 339 into our formula, we get:
(18 + 339)/2 = 178.5
Thus, the number halfway between 18 and 339 is 178.5.
To check that our answer is correct, we subtract 18 from 178.5 and subtract 178.5 from 339 and compare the two numbers:
178.5 - 18 = 160.5
339 - 178.5 = 160.5
As you can see, the halfway number is 160.5 higher than 18 and 160.5 lower than 339. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 18 and 340
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