а) Выполни умножение: 32 × 7; 57 × 9; 78 × 6; 94 × 5; 63 × 4.

32 × 7 = 30 × 7 + 2 × 7 = 210 + 14 = 224.

57 × 9 = 50 × 9 + 7 × 9 = 450 + 63 = 513.

78 × 6 = 70 × 6 + 8 × 6 = 420 + 48 = 468.

94 × 5 = 90 × 5 + 4 × 5 = 450 + 20 = 470.

63 × 4 = 60 × 4 + 3 × 4 = 240 + 12 = 252.