When you ask "What number is halfway between 30 and 247?" 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=247.
To find the number halfway between 30 and 247, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 247 into our formula, we get:
(30 + 247)/2 = 138.5
Thus, the number halfway between 30 and 247 is 138.5.
To check that our answer is correct, we subtract 30 from 138.5 and subtract 138.5 from 247 and compare the two numbers:
138.5 - 30 = 108.5
247 - 138.5 = 108.5
As you can see, the halfway number is 108.5 higher than 30 and 108.5 lower than 247. Therefore, our halfway between answer of 138.5 above is correct.
Halfway Between
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Halfway Between 30 and 248
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