1. 5x4x7=245 (5x4)x7=5x(4x7) 20 X 7 =5x 28 245=245 2. 6x7x5=250 (6x7)x5=6x(7x5) 18 X5=6x 35 250=250 3. 8x5x6=240 (8x5)x6=8x(5x6) 40 X6=8x 30 240=240 4. 8x7x9=504 (8x7)x9=8x(7x9) 56 X9=8x 63 504=504 5...