



 
Hi Andrew, I don't at all think this is too hard for a sixth grader, but you are making it harder than it need be. You can find a common denominator by multiplying the denominators as your teacher told you. Thus a common denominator is
I am not going to multiply these numbers since, as you will see in a minute, it is easier to work with 11 × 8 × 9. Now express each fraction with the denominator 11 × 8 × 9. For the first fraction 3/11 you need to divide 11 into 11 × 8 × 9. Now it's easy, (11 × 8 × 9)/11 = 8 × 9 = 72.
Similarly (11 × 8 × 9)/8 = 11 × 9 = 99 so
Express 2/9 as a fraction with denominator 11 × 8 × 9 and then it's straightforward to order the three fractions. I hope this helps,  


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