When you ask "What number is halfway between 20 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=20 and Y=259.
To find the number halfway between 20 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 259 into our formula, we get:
(20 + 259)/2 = 139.5
Thus, the number halfway between 20 and 259 is 139.5.
To check that our answer is correct, we subtract 20 from 139.5 and subtract 139.5 from 259 and compare the two numbers:
139.5 - 20 = 119.5
259 - 139.5 = 119.5
As you can see, the halfway number is 119.5 higher than 20 and 119.5 lower than 259. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 20 and 260
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