When you ask "What number is halfway between 78 and 169?" 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=169.
To find the number halfway between 78 and 169, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 169 into our formula, we get:
(78 + 169)/2 = 123.5
Thus, the number halfway between 78 and 169 is 123.5.
To check that our answer is correct, we subtract 78 from 123.5 and subtract 123.5 from 169 and compare the two numbers:
123.5 - 78 = 45.5
169 - 123.5 = 45.5
As you can see, the halfway number is 45.5 higher than 78 and 45.5 lower than 169. Therefore, our halfway between answer of 123.5 above is correct.
Halfway Between
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Halfway Between 78 and 170
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