30 × 5 × 4 = 600
30 + 24 = 54
30 × 54 = 1,620
3 × 54 = 162
15 × 3 + 10
15 + 3 + 10
15 × 3 × 3
15 × 3 × 10
3 × 10 × 15
3 × 10 + 15
3 × 10 × 10
3 + 10 × 15
