When you ask "What number is halfway between 78 and 163?" 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=163.
To find the number halfway between 78 and 163, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 163 into our formula, we get:
(78 + 163)/2 = 120.5
Thus, the number halfway between 78 and 163 is 120.5.
To check that our answer is correct, we subtract 78 from 120.5 and subtract 120.5 from 163 and compare the two numbers:
120.5 - 78 = 42.5
163 - 120.5 = 42.5
As you can see, the halfway number is 42.5 higher than 78 and 42.5 lower than 163. Therefore, our halfway between answer of 120.5 above is correct.
Halfway Between
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Halfway Between 78 and 164
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