4x5 x6 = 5x4x6 1x5x7=7x50 4x2x6=6×2 x 3 x 53 x 7 x 5 x 7 x 8 = 7 x 8 x 5 3 x 9 x 7 = 7 × × 3 6xx3 = 5 x 6 x 3 { 7 x 6 x 8 = 6 x ►=8​