When you ask "What number is halfway between 3 and 290?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=3 and Y=290.
To find the number halfway between 3 and 290, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 290 into our formula, we get:
(3 + 290)/2 = 146.5
Thus, the number halfway between 3 and 290 is 146.5.
To check that our answer is correct, we subtract 3 from 146.5 and subtract 146.5 from 290 and compare the two numbers:
146.5 - 3 = 143.5
290 - 146.5 = 143.5
As you can see, the halfway number is 143.5 higher than 3 and 143.5 lower than 290. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 3 and 291
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