When you ask "What number is halfway between 30 and 275?" 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=275.
To find the number halfway between 30 and 275, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 275 into our formula, we get:
(30 + 275)/2 = 152.5
Thus, the number halfway between 30 and 275 is 152.5.
To check that our answer is correct, we subtract 30 from 152.5 and subtract 152.5 from 275 and compare the two numbers:
152.5 - 30 = 122.5
275 - 152.5 = 122.5
As you can see, the halfway number is 122.5 higher than 30 and 122.5 lower than 275. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 30 and 276
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