When you ask "What number is halfway between 30 and 811?" 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=811.
To find the number halfway between 30 and 811, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 811 into our formula, we get:
(30 + 811)/2 = 420.5
Thus, the number halfway between 30 and 811 is 420.5.
To check that our answer is correct, we subtract 30 from 420.5 and subtract 420.5 from 811 and compare the two numbers:
420.5 - 30 = 390.5
811 - 420.5 = 390.5
As you can see, the halfway number is 390.5 higher than 30 and 390.5 lower than 811. Therefore, our halfway between answer of 420.5 above is correct.
Halfway Between
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Halfway Between 30 and 812
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