When you ask "What number is halfway between 5 and 80?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=5 and Y=80.
To find the number halfway between 5 and 80, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 80 into our formula, we get:
(5 + 80)/2 = 42.5
Thus, the number halfway between 5 and 80 is 42.5.
To check that our answer is correct, we subtract 5 from 42.5 and subtract 42.5 from 80 and compare the two numbers:
42.5 - 5 = 37.5
80 - 42.5 = 37.5
As you can see, the halfway number is 37.5 higher than 5 and 37.5 lower than 80. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 5 and 81
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