1)125 ×(17 × 8)× 4 = 125×8×4×17 =1000×68 =68000 2)13 × 99 =13×(100-1) =1300-13 =1287 3)25x16x125 =25×2×8×125 =50000 4)375x480+6250x48 =480×(375+625) =480000 5)210 ÷ 42 × 6 =210÷7÷6×6 =30 6)7900 ÷ 4 ÷ 25 =7900÷(4×25) =79 7)150 × 40 ÷ 50 =150÷50×40 =3×40 =12 08)5600 ÷(25 ×7) =56×100÷25÷7 =56÷7×100÷25 =32 9)39600 ÷ 25 =396×100÷25 =396×4 =1584 10)27000 ÷ 125 =27×1000÷125 =27×8