pakai proses ya kaka

13. 21/49= 21:7=3=3/7
               = 49:7=7
 
14. 1 1/2, 2/3,12%,0,25= 450/300,200/300,36/300,75/300
                                     =12%,0,25,2/3,1 1/2

15. 4/9 × 1/5 =4/45

16.15/9- 3/9÷ 1/9=12/9×9/1=12 potong

maafb bila salah, semoga mmbantu