When you ask "What number is halfway between 69 and 311?" 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=311.
To find the number halfway between 69 and 311, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 311 into our formula, we get:
(69 + 311)/2 = 190
Thus, the number halfway between 69 and 311 is 190.
To check that our answer is correct, we subtract 69 from 190 and subtract 190 from 311 and compare the two numbers:
190 - 69 = 121
311 - 190 = 121
As you can see, the halfway number is 121 higher than 69 and 121 lower than 311. Therefore, our halfway between answer of 190 above is correct.
Halfway Between
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Halfway Between 69 and 312
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