When you ask "What number is halfway between 18 and 739?" 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=739.
To find the number halfway between 18 and 739, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 739 into our formula, we get:
(18 + 739)/2 = 378.5
Thus, the number halfway between 18 and 739 is 378.5.
To check that our answer is correct, we subtract 18 from 378.5 and subtract 378.5 from 739 and compare the two numbers:
378.5 - 18 = 360.5
739 - 378.5 = 360.5
As you can see, the halfway number is 360.5 higher than 18 and 360.5 lower than 739. Therefore, our halfway between answer of 378.5 above is correct.
Halfway Between
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Halfway Between 18 and 740
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