When you ask "What number is halfway between 30 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=30 and Y=879.
To find the number halfway between 30 and 879, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 879 into our formula, we get:
(30 + 879)/2 = 454.5
Thus, the number halfway between 30 and 879 is 454.5.
To check that our answer is correct, we subtract 30 from 454.5 and subtract 454.5 from 879 and compare the two numbers:
454.5 - 30 = 424.5
879 - 454.5 = 424.5
As you can see, the halfway number is 424.5 higher than 30 and 424.5 lower than 879. Therefore, our halfway between answer of 454.5 above is correct.
Halfway Between
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Halfway Between 30 and 880
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