When you ask "What number is halfway between 30 and 248?" 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=248.
To find the number halfway between 30 and 248, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 248 into our formula, we get:
(30 + 248)/2 = 139
Thus, the number halfway between 30 and 248 is 139.
To check that our answer is correct, we subtract 30 from 139 and subtract 139 from 248 and compare the two numbers:
139 - 30 = 109
248 - 139 = 109
As you can see, the halfway number is 109 higher than 30 and 109 lower than 248. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 30 and 249
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