8.909 is bigger. Look first at the digit farthest to the left. That is the 1's column. It is 8 in both cases. Now move one column to the right. That is the tenth's column. In 8.090, the digit is 0. In 8.909, it is 9. 9 is bigger than 0; so 8.909 is bigger than 8.090. You don't need to go any farther to determine which number is bigger.
1+8 2+7 3+6 4+5 9+0
0.6 is bigger than 0.06
yes
7/10 is bigger than 6/9
0
8
The ISBN of The Pigman is 978-0-06-075735-9.
No, -3 is less than 0 which is obviously less than 9.
The ISBN of The Bridge - novel - is 0-06-105358-9.
The ISBN of Behind the Curtain is 0-06-073706-9.
The ISBN of This is Orson Welles is 0-06-016616-9.
The ISBN of Among Grizzlies is 0-06-017393-9.
The ISBN of The Hostile Hospital is 0-06-175720-9.
The ISBN of Cadillac Beach is 0-06-052046-9.
The ISBN of Zucchini - novel - is 0-06-021394-9.
The ISBN of A Tree Is Nice is 0-06-443147-9.