Line up the numbers at the decimal and follow each digit from left to right and find the greatest. Obviously, 67 comes after 66, so that is going to be the greatest. Now in the tens place after the decimal, 0 is the least (66.087), so it will go first, then 6 (66.6), then 7 (66.87).
66.087,
66.6,
66.87,
67.00
