When you ask "What number is halfway between 18 and 845?" 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=845.
To find the number halfway between 18 and 845, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 845 into our formula, we get:
(18 + 845)/2 = 431.5
Thus, the number halfway between 18 and 845 is 431.5.
To check that our answer is correct, we subtract 18 from 431.5 and subtract 431.5 from 845 and compare the two numbers:
431.5 - 18 = 413.5
845 - 431.5 = 413.5
As you can see, the halfway number is 413.5 higher than 18 and 413.5 lower than 845. Therefore, our halfway between answer of 431.5 above is correct.
Halfway Between
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Halfway Between 18 and 846
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