When you ask "What number is halfway between 30 and 877?" 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=877.
To find the number halfway between 30 and 877, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 877 into our formula, we get:
(30 + 877)/2 = 453.5
Thus, the number halfway between 30 and 877 is 453.5.
To check that our answer is correct, we subtract 30 from 453.5 and subtract 453.5 from 877 and compare the two numbers:
453.5 - 30 = 423.5
877 - 453.5 = 423.5
As you can see, the halfway number is 423.5 higher than 30 and 423.5 lower than 877. Therefore, our halfway between answer of 453.5 above is correct.
Halfway Between
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Halfway Between 30 and 878
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