When you ask "What number is halfway between 18 and 697?" 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=697.
To find the number halfway between 18 and 697, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 697 into our formula, we get:
(18 + 697)/2 = 357.5
Thus, the number halfway between 18 and 697 is 357.5.
To check that our answer is correct, we subtract 18 from 357.5 and subtract 357.5 from 697 and compare the two numbers:
357.5 - 18 = 339.5
697 - 357.5 = 339.5
As you can see, the halfway number is 339.5 higher than 18 and 339.5 lower than 697. Therefore, our halfway between answer of 357.5 above is correct.
Halfway Between
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Halfway Between 18 and 698
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