kakak kakak tolong jawab dengan caranya ya dari nomor 1 sampai nomor 12?

1. 0,5 × 0,9 = 0,45
2. 2,4 × 0,4 = 0,96
3. 0,81 × 1,5 = 1,215
4. 6,6 × 1,82 = 12,012
5. 3/8 × 2,5 = 3/8 × 25/10 = 75/80 = 15/16
6. 2,1 × 2/5 = 21/10 × 2/5 = 42/50 = 21/25
7. 4,2 × 3/7 = 42/10 × 3/7 = 126/70 = 9/5 = 1 4/5
8. 3/4 × 15% = 3/4 × 15/100 = 45/400 = 9/80
9. 5/6 × 54% = 5/6 × 54/100 = 270/600 = 9/20
10. 88% × 3/8 = 88/100 × 3/8 = 264/800 = 33/100 = 0,33 atau 33%
11. 24% × 0,5 = 0,24 × 0,5 = 0,120
12. 35% × 0,8 × 3/4 = 35/100 × 8/10 × 3/4 = 840/4000 = 21/100 = 0,21 atau 21%