When you ask "What number is halfway between 18 and 755?" 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=755.
To find the number halfway between 18 and 755, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 755 into our formula, we get:
(18 + 755)/2 = 386.5
Thus, the number halfway between 18 and 755 is 386.5.
To check that our answer is correct, we subtract 18 from 386.5 and subtract 386.5 from 755 and compare the two numbers:
386.5 - 18 = 368.5
755 - 386.5 = 368.5
As you can see, the halfway number is 368.5 higher than 18 and 368.5 lower than 755. Therefore, our halfway between answer of 386.5 above is correct.
Halfway Between
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Halfway Between 18 and 756
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