(4 ⋅ 9) ⋅ 25 = (25 ⋅ 4) ⋅ 9 = 100 ⋅ 9 = 900

(2 ⋅ 8) ⋅ 50 = (50 ⋅ 2) ⋅ 8 = 100 ⋅ 8 = 800

25 ⋅ (7 ⋅ 4) = (25 ⋅ 4) ⋅ 7 = 100 ⋅ 7 = 700

40 ⋅ (5 ⋅ 3) = (40 ⋅ 5) ⋅ 3 = 200 ⋅ 3 = 600

(2 ⋅ 4) ⋅ 50 = (50 ⋅ 2) ⋅ 4 = 100 ⋅ 4 = 400

5 ⋅ (12 ⋅ 2) = (5 ⋅ 2) ⋅ 12 = 10 ⋅ 12 = 120