When you ask "What number is halfway between 18 and 835?" 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=835.
To find the number halfway between 18 and 835, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 835 into our formula, we get:
(18 + 835)/2 = 426.5
Thus, the number halfway between 18 and 835 is 426.5.
To check that our answer is correct, we subtract 18 from 426.5 and subtract 426.5 from 835 and compare the two numbers:
426.5 - 18 = 408.5
835 - 426.5 = 408.5
As you can see, the halfway number is 408.5 higher than 18 and 408.5 lower than 835. Therefore, our halfway between answer of 426.5 above is correct.
Halfway Between
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Halfway Between 18 and 836
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