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67 x 6 =60*6+7*6=360+42=402
137 x 50 =100*50+30*50+7*50=5000+1500+350=6850
270 : 5 =200:5+70:5=40+14=54
3900 : 50 =3000:50+900:50=60+18=78
47 x 12 =40*12+7*12=480+84=564
125 x 8 =100*8+25*8=800+200=1000
38 x 25 =30*25+8*25=750+200=950
58 x 11 =58*10+58*1=580+58=638