When you ask "What number is halfway between 12 and 151?" 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=151.
To find the number halfway between 12 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 151 into our formula, we get:
(12 + 151)/2 = 81.5
Thus, the number halfway between 12 and 151 is 81.5.
To check that our answer is correct, we subtract 12 from 81.5 and subtract 81.5 from 151 and compare the two numbers:
81.5 - 12 = 69.5
151 - 81.5 = 69.5
As you can see, the halfway number is 69.5 higher than 12 and 69.5 lower than 151. Therefore, our halfway between answer of 81.5 above is correct.
Halfway Between
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Halfway Between 12 and 152
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