When you ask "What number is halfway between 9 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=9 and Y=290.
To find the number halfway between 9 and 290, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 290 into our formula, we get:
(9 + 290)/2 = 149.5
Thus, the number halfway between 9 and 290 is 149.5.
To check that our answer is correct, we subtract 9 from 149.5 and subtract 149.5 from 290 and compare the two numbers:
149.5 - 9 = 140.5
290 - 149.5 = 140.5
As you can see, the halfway number is 140.5 higher than 9 and 140.5 lower than 290. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 9 and 291
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