When you ask "What number is halfway between 3 and 30?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=3 and Y=30.
To find the number halfway between 3 and 30, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 30 into our formula, we get:
(3 + 30)/2 = 16.5
Thus, the number halfway between 3 and 30 is 16.5.
To check that our answer is correct, we subtract 3 from 16.5 and subtract 16.5 from 30 and compare the two numbers:
16.5 - 3 = 13.5
30 - 16.5 = 13.5
As you can see, the halfway number is 13.5 higher than 3 and 13.5 lower than 30. Therefore, our halfway between answer of 16.5 above is correct.
Halfway Between
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Halfway Between 3 and 31
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