When you ask "What number is halfway between 12 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=12 and Y=251.
To find the number halfway between 12 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 251 into our formula, we get:
(12 + 251)/2 = 131.5
Thus, the number halfway between 12 and 251 is 131.5.
To check that our answer is correct, we subtract 12 from 131.5 and subtract 131.5 from 251 and compare the two numbers:
131.5 - 12 = 119.5
251 - 131.5 = 119.5
As you can see, the halfway number is 119.5 higher than 12 and 119.5 lower than 251. Therefore, our halfway between answer of 131.5 above is correct.
Halfway Between
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Halfway Between 12 and 252
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