Oblicz sprytnie 6 *51 , 47*5,137*5,5*256,58*11,121*11,65*110
np 35 *16 =35*16=35*2*8=70*8=560
ta liczba co jest na czarno trzeba ją rozpisacv np 16= 2*8 bp 2*8 to 16
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6×51=3×51×2=153×2=306
47×5=40×5+7×5=200+35=235
137×5=100×5+30×5+7×5=500+150+35=685
5×256=5×200+5×50×5×6=1000+250+30=1280
58×11=58×10+58×1=580+58=638
121×11=121×10+121×1=1210+121=1331
65×110=65×100+65×10=6500+650=7150