When you ask "What number is halfway between 81 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=81 and Y=259.
To find the number halfway between 81 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 259 into our formula, we get:
(81 + 259)/2 = 170
Thus, the number halfway between 81 and 259 is 170.
To check that our answer is correct, we subtract 81 from 170 and subtract 170 from 259 and compare the two numbers:
170 - 81 = 89
259 - 170 = 89
As you can see, the halfway number is 89 higher than 81 and 89 lower than 259. Therefore, our halfway between answer of 170 above is correct.
Halfway Between
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Halfway Between 81 and 260
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