When you ask "What number is halfway between 13 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=13 and Y=259.
To find the number halfway between 13 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 259 into our formula, we get:
(13 + 259)/2 = 136
Thus, the number halfway between 13 and 259 is 136.
To check that our answer is correct, we subtract 13 from 136 and subtract 136 from 259 and compare the two numbers:
136 - 13 = 123
259 - 136 = 123
As you can see, the halfway number is 123 higher than 13 and 123 lower than 259. Therefore, our halfway between answer of 136 above is correct.
Halfway Between
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Halfway Between 13 and 260
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