( 1)300÷ 125÷8=300÷( 125×8)=300÷ 1000=0.3

(2)396-96- 172-28 =(396-96)-( 172+28)= 300-200 = 100

(3) 125*24 = 125*8*3 = 1000*3 = 3000

(4)26* 15 = (20+6)* 15 = 20* 15 + 6* 15 = 300+90 =390

(5)25*99*4 = 25*4*99 = 100*99 = 9900

(6)250*32 = 250*4*8 = 1000*8 = 8000