9•(4•25)
15•(4•9)
11•(10•3)
10•(29•2)

9*(4*25) = 9*100 = 90015*(4*9) = (15*4)*9 = 60*9 = 54011*(10*3) = (11*10)*3 = 110*3 = 33010*(29*2) = 10*58 = 580