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First we found the common denominator by listing the multiples of 15,9 and 11.
we listed them till we found a number that ocured in all the multiples.This was 495.This would be the denominator.

So wth 495 we found out how many 11 go into it.so on the calculator we typed
495 divided by 11= 45
Then
6x45=270
So 270 would be are numerator.
The equvilent fraction to 6/11 would be 270/495.

We did the same to 15 and 9 and got 231 for 15 as the denomnator and 220 for 9 as the denominator.
so the equvilent fracton for 7/15 is 231/495 and the equvilent fraction for 4/9 is 220/495.

The largest fracton is 6/11`