
When you ask "What number is halfway between 30 and 103?" 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=103.

To find the number halfway between 30 and 103, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 103 into our formula, we get:
(30 + 103)/2 = 66.5
Thus, the number halfway between 30 and 103 is 66.5.
To check that our answer is correct, we subtract 30 from 66.5 and subtract 66.5 from 103 and compare the two numbers:
66.5 - 30 = 36.5
103 - 66.5 = 36.5
As you can see, the halfway number is 36.5 higher than 30 and 36.5 lower than 103. Therefore, our halfway between answer of 66.5 above is correct.
Halfway Between
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Halfway Between 30 and 104
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