tolong dijawab menggunakan cara ya terima kasih

Mapel : Matematika
Bab : Pecahan

1)

3/4 × 12 = 3 × 3 = 9

2)

4/5 × 20 = 4 × 4 = 16

3)

2/3 × 15 = 2 × 5= 10

4)

3/7 × 21 = 3 × 3 = 9

5)

4/9 ×27 = 4 × 3 = 12