a) 5/24 × 6 = 1/6 × 5/24 = 5/144
5/24 × 3 = 1/3 × 5/24 = 5/72
5/24 × 4 = 1/4 × 5/24 = 5/96
b) 3 × 2/7 = 1/3 × 2/7 = 2/21
3 × 1/6 = 1/3 × 1/6 = 1/18
3 × 2/9 = 1/3 × 2/9 = 2/27
