When you ask "What number is halfway between 78 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=78 and Y=151.
To find the number halfway between 78 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 151 into our formula, we get:
(78 + 151)/2 = 114.5
Thus, the number halfway between 78 and 151 is 114.5.
To check that our answer is correct, we subtract 78 from 114.5 and subtract 114.5 from 151 and compare the two numbers:
114.5 - 78 = 36.5
151 - 114.5 = 36.5
As you can see, the halfway number is 36.5 higher than 78 and 36.5 lower than 151. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 78 and 152
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