Step-by-step explanation:
1. 2/3 + 2/5
= (2 × 5)/(3 × 5) + (2 × 3)/(5 × 3)
= 10/15 + 6/15
= 16/15
= 1 1/15
2. 8!
= (8 × 7) × (6 × 5) × (4 × 3) × (2 × 1)
= 56 × 30 × 12 × 2
= 56 × 30 × 24
= 56 × 720
= 40.320
