
When you ask "What number is halfway between 30 and 910?" 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=910.

To find the number halfway between 30 and 910, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 910 into our formula, we get:
(30 + 910)/2 = 470
Thus, the number halfway between 30 and 910 is 470.
To check that our answer is correct, we subtract 30 from 470 and subtract 470 from 910 and compare the two numbers:
470 - 30 = 440
910 - 470 = 440
As you can see, the halfway number is 440 higher than 30 and 440 lower than 910. Therefore, our halfway between answer of 470 above is correct.
Halfway Between
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Halfway Between 30 and 911
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