When you ask "What number is halfway between 40 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=40 and Y=259.
To find the number halfway between 40 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 259 into our formula, we get:
(40 + 259)/2 = 149.5
Thus, the number halfway between 40 and 259 is 149.5.
To check that our answer is correct, we subtract 40 from 149.5 and subtract 149.5 from 259 and compare the two numbers:
149.5 - 40 = 109.5
259 - 149.5 = 109.5
As you can see, the halfway number is 109.5 higher than 40 and 109.5 lower than 259. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 40 and 260
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