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549 + 262 = 540+260+9+2=800+11=811
398 + 298 = 390+290+8+8-680+16=696
324 * 4 = 300*4+20*4+4*4=1200+80+16=1296
67 * 6 = 60*6+7*6=360+42=402
47 * 5 = 40*5+7*5=200+35=235
137 * 50 = 100*50+30*50+7*50=5000+1500+350=6850
270 : 5 = 200:5+70:5=40+14=54
3900 : 50 = 3500:50+400:50=70+8=78