When you ask "What number is halfway between 9 and 486?" 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=486.
To find the number halfway between 9 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 486 into our formula, we get:
(9 + 486)/2 = 247.5
Thus, the number halfway between 9 and 486 is 247.5.
To check that our answer is correct, we subtract 9 from 247.5 and subtract 247.5 from 486 and compare the two numbers:
247.5 - 9 = 238.5
486 - 247.5 = 238.5
As you can see, the halfway number is 238.5 higher than 9 and 238.5 lower than 486. Therefore, our halfway between answer of 247.5 above is correct.
Halfway Between
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Halfway Between 9 and 487
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