When you ask "What number is halfway between 78 and 125?" 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=125.
To find the number halfway between 78 and 125, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 125 into our formula, we get:
(78 + 125)/2 = 101.5
Thus, the number halfway between 78 and 125 is 101.5.
To check that our answer is correct, we subtract 78 from 101.5 and subtract 101.5 from 125 and compare the two numbers:
101.5 - 78 = 23.5
125 - 101.5 = 23.5
As you can see, the halfway number is 23.5 higher than 78 and 23.5 lower than 125. Therefore, our halfway between answer of 101.5 above is correct.
Halfway Between
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Halfway Between 78 and 126
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