а) 3 × 5 = 15; 7 × 2 = 14; 3 × 6 = 18; 5 × 2 = 10; 3 × 7 = 21.
б) 6 × 2 = 12; 8 × 3 = 24; 2 × 8 = 16; 7 × 3 = 21; 5 × 3 = 15.
в) 5 × 2 = 10; 3 × 4 = 12; 2 × 7 = 14; 6 × 3 = 18; 3 × 8 = 24.