1)205*52
=200*52+5*52
=10660
2)25*44
=25*4*11
=1100
3)812+197+78
=812+78+197=1097
4)125*88
=125*8*11
=11000
5)35*68+68*64+68
=68*(35+64+1)
=6800
6)125*(12*4)
=125*8*6
=6000
7)69*99+69
=69*(99+1)
=6900
8)102*77-77*2
=(102-2)*77
=7700
9)303*68-68*3
=(303-3)*68
=20400