Multiplication and Division of rational number

1
choose the correct answer
2
choose the correct answer
3
choose the correct answer
4
choose the correct answer
5
choose the correct answer
6
choose the correct answer
7
choose the correct answer
8
choose the correct answer
9
choose the correct answer
10
choose the correct answer
11
choose the correct answer
12
check the statement
13
check the statement
14
check the statement
15
check the statement
16
check the statement