When you ask "What number is halfway between 69 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=69 and Y=80.
To find the number halfway between 69 and 80, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 80 into our formula, we get:
(69 + 80)/2 = 74.5
Thus, the number halfway between 69 and 80 is 74.5.
To check that our answer is correct, we subtract 69 from 74.5 and subtract 74.5 from 80 and compare the two numbers:
74.5 - 69 = 5.5
80 - 74.5 = 5.5
As you can see, the halfway number is 5.5 higher than 69 and 5.5 lower than 80. Therefore, our halfway between answer of 74.5 above is correct.
Halfway Between
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Halfway Between 69 and 81
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