When you ask "What number is halfway between 18 and 709?" 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=709.
To find the number halfway between 18 and 709, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 709 into our formula, we get:
(18 + 709)/2 = 363.5
Thus, the number halfway between 18 and 709 is 363.5.
To check that our answer is correct, we subtract 18 from 363.5 and subtract 363.5 from 709 and compare the two numbers:
363.5 - 18 = 345.5
709 - 363.5 = 345.5
As you can see, the halfway number is 345.5 higher than 18 and 345.5 lower than 709. Therefore, our halfway between answer of 363.5 above is correct.
Halfway Between
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Halfway Between 18 and 710
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