Tính nhẩm 5 × 1 = …… 5 × 3 = ….. 5 × 2 = ……

5 × 1 = 5                                              5 × 3 = 15

5 × 2 = 10                                            5 × 5 = 25

5 × 4 = 20                                            5 × 8 = 40

5 × 6 = 30                                            5 × 9 = 45