When you ask "What number is halfway between 69 and 139?" 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=139.
To find the number halfway between 69 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 139 into our formula, we get:
(69 + 139)/2 = 104
Thus, the number halfway between 69 and 139 is 104.
To check that our answer is correct, we subtract 69 from 104 and subtract 104 from 139 and compare the two numbers:
104 - 69 = 35
139 - 104 = 35
As you can see, the halfway number is 35 higher than 69 and 35 lower than 139. Therefore, our halfway between answer of 104 above is correct.
Halfway Between
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Halfway Between 69 and 140
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