Oblicz sprytnie ; 43razy 5= 8 razy 41 = 45razy 16= 5 razy 123 = 54 razy 9= 35 razy 90= 65 razy 11= 11 razy 270=

43*5=40*5+3*5=200+15=215 8*41=8*40+8*1=320+8=328 45*16=40*16+5*16=640+80=720 5*123=5*120+5*3=600+15=615 54*9=50*9+4*9=450+36=486 35*90=30*90+5*90=2700+450=3150 65*11=60*11+5*11=660+55=715 11*270=10*270+1*270=2700+270=2970   Mam nadzieję,że pomogłm ;]]

43 *5 = 40*5 + 3*5= 200 + 15 = 215 8 *41 = 8* 40 + 8 *1 = 320 + 8 = 328 45 *16 = 45*10 + 45*6 = 450 + 270 = 720 5 * 123 = 5 *100 + 5*23 = 500 + 115 = 615 54 *9 = 54*10 - 54 *1 = 540 - 54 = 486 35 * 90 = 30 *90 + 5 *90 = 2700 +450= 3150 lub  35*90= 35*100 - 35*10 = 3500 - 350 = 3150 65 *11 = 65 *10 + 65*1 = 650 + 65 = 715 11 * 270 = 10 *270 + 1*270= 2700 +270= 2970