When you ask "What number is halfway between 30 and 251?" 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=251.
To find the number halfway between 30 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 251 into our formula, we get:
(30 + 251)/2 = 140.5
Thus, the number halfway between 30 and 251 is 140.5.
To check that our answer is correct, we subtract 30 from 140.5 and subtract 140.5 from 251 and compare the two numbers:
140.5 - 30 = 110.5
251 - 140.5 = 110.5
As you can see, the halfway number is 110.5 higher than 30 and 110.5 lower than 251. Therefore, our halfway between answer of 140.5 above is correct.
Halfway Between
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Halfway Between 30 and 252
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