When you ask "What number is halfway between 18 and 879?" 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=879.
To find the number halfway between 18 and 879, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 879 into our formula, we get:
(18 + 879)/2 = 448.5
Thus, the number halfway between 18 and 879 is 448.5.
To check that our answer is correct, we subtract 18 from 448.5 and subtract 448.5 from 879 and compare the two numbers:
448.5 - 18 = 430.5
879 - 448.5 = 430.5
As you can see, the halfway number is 430.5 higher than 18 and 430.5 lower than 879. Therefore, our halfway between answer of 448.5 above is correct.
Halfway Between
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Halfway Between 18 and 880
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