When you ask "What number is halfway between 30 and 55?" 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=55.
To find the number halfway between 30 and 55, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 55 into our formula, we get:
(30 + 55)/2 = 42.5
Thus, the number halfway between 30 and 55 is 42.5.
To check that our answer is correct, we subtract 30 from 42.5 and subtract 42.5 from 55 and compare the two numbers:
42.5 - 30 = 12.5
55 - 42.5 = 12.5
As you can see, the halfway number is 12.5 higher than 30 and 12.5 lower than 55. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 30 and 56
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