(24 + 8) + 12 = 24 + (8 + )

8 + 6 + 4 = 8 + (6 + )

63 + 37 + 98 = (63 + ) + 98

 + 0 = 87

a) 36 + 14 + 9 = ……………                                  b) 51 + 12 + 18 = ……………

                       = ……………                                                            = ……………

                       = ……………                                                            = ……………

 c) 65 + 9 + 5 = ……………                                   d) 31 + 26 + 69 = ……………

                       = ……………                                                            = ……………

                       = ……………                                                            = ……………

32 + 146 + 18 =  ……………

                       =  ……………