When you ask "What number is halfway between 18 and 659?" 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=659.
To find the number halfway between 18 and 659, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 659 into our formula, we get:
(18 + 659)/2 = 338.5
Thus, the number halfway between 18 and 659 is 338.5.
To check that our answer is correct, we subtract 18 from 338.5 and subtract 338.5 from 659 and compare the two numbers:
338.5 - 18 = 320.5
659 - 338.5 = 320.5
As you can see, the halfway number is 320.5 higher than 18 and 320.5 lower than 659. Therefore, our halfway between answer of 338.5 above is correct.
Halfway Between
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Halfway Between 18 and 660
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