Maths ascending and descending

做左但老師唔同我對答案 , 唔知岩唔岩 , 可以幫忙給我答案對對嗎 ?
A. Arrange each of the following sets of fractions in ascending order :
a). 11 1 2 1 b.) 1 5 13 2
----, ----, ---- , --- ---- , ---- , ---- , ----
18 4 9 3 4 8 20 5


c.) 3 19 1 7 d.) 1 2 8 3
---- , ----- , ----, ---- ---- , -----, ----, ----
4 22 2 11 6 3 21 7



B. Arrange each of the following sets of fractions in descending order :


a.) 1 1 1 1 b.) 3 1 1 1
--- , --- , --- , --- ----, ----, ----, ----
2 4 3 6 8 6 3 4


c.) 3 7 3 1 d. ) 5 3 1 1
--- , --- , --- , --- ---- , ---- , ---- , ----
5 10 4 2 14 7 2 4