When you ask "What number is halfway between 5 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=5 and Y=30.
To find the number halfway between 5 and 30, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 30 into our formula, we get:
(5 + 30)/2 = 17.5
Thus, the number halfway between 5 and 30 is 17.5.
To check that our answer is correct, we subtract 5 from 17.5 and subtract 17.5 from 30 and compare the two numbers:
17.5 - 5 = 12.5
30 - 17.5 = 12.5
As you can see, the halfway number is 12.5 higher than 5 and 12.5 lower than 30. Therefore, our halfway between answer of 17.5 above is correct.
Halfway Between
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Halfway Between 5 and 31
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