Răspuns:
14×5= (10×5)+(4×5)=50+20=70
16×4= (10×4)+(6×4)=40+24=64
19×9= (10×9)+(9×9)=90+81=171
13×6= (10×6)+(3×6)=60+18=78
34×8= (30×8)+(4×8)=240+32=272
5×68= (60×5)+(8×5)=300+40=340
72×3= (70×3)+(2×3)=210+6=216
28×2= (20×2)+(8×2)=40+16=56
9×75= (70×9)+(5×9)=630+45=675