Oblicz sprytnie: 43*5= 8*41= 45*16= 5*123= 54*9= 35*90= 65*11= 11*270+
43*5=430:2=215
8*41=8*40+8*1=320+8=328
45*16=45*15+45*1=675+45=720
5*123=1230:2=615
54*9=54*10-54*1=540-54=486
35*90=35*100-35*10=3500-35=3465
65*11=65*10+65*1=650+65=715
11*270=10*270+270*1=2700+270=2970
215+328+720+615+486+3150+715+2970=9199
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43*5=430:2=215
8*41=8*40+8*1=320+8=328
45*16=45*15+45*1=675+45=720
5*123=1230:2=615
54*9=54*10-54*1=540-54=486
35*90=35*100-35*10=3500-35=3465
65*11=65*10+65*1=650+65=715
11*270=10*270+270*1=2700+270=2970
215+328+720+615+486+3150+715+2970=9199