When the same two digits are next to each other, such as 2.2 you know the relationship is that the 2 in the ones place is exactly 10 x that of the 2 in the tenths place. The same relationship applies that the 2 in the tenths place is exactly 1/10 that of the 2 in the tens place. So the number to the left of the other would be a multiple of that number; the number on the right of the other would be a division of the that number.
