When you ask "What number is halfway between 30 and 921?" 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=921.
To find the number halfway between 30 and 921, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 921 into our formula, we get:
(30 + 921)/2 = 475.5
Thus, the number halfway between 30 and 921 is 475.5.
To check that our answer is correct, we subtract 30 from 475.5 and subtract 475.5 from 921 and compare the two numbers:
475.5 - 30 = 445.5
921 - 475.5 = 445.5
As you can see, the halfway number is 445.5 higher than 30 and 445.5 lower than 921. Therefore, our halfway between answer of 475.5 above is correct.
Halfway Between
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Halfway Between 30 and 922
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