When you ask "What number is halfway between 11 and 259?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=259.
To find the number halfway between 11 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 259 into our formula, we get:
(11 + 259)/2 = 135
Thus, the number halfway between 11 and 259 is 135.
To check that our answer is correct, we subtract 11 from 135 and subtract 135 from 259 and compare the two numbers:
135 - 11 = 124
259 - 135 = 124
As you can see, the halfway number is 124 higher than 11 and 124 lower than 259. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 11 and 260
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