1)72 = 63 + 9
63 : 9 = 7
9 : 9 = 1
2)54 = 18 + 36
36 : 9 = 4
18 : 9 = 2
3)27 = 18 + 9
4)63 = 27 + 36
27 : 9 = 3
1)72 = 63 + 9
63 : 9 = 7
9 : 9 = 1
2)54 = 18 + 36
36 : 9 = 4
18 : 9 = 2
3)27 = 18 + 9
18 : 9 = 2
9 : 9 = 1
4)63 = 27 + 36
27 : 9 = 3
36 : 9 = 4