Matematyka kl. V ! Oblicz sprytnie ( trzeba to rozpisać ! ) :
43x5=
8x41=
45x16=
5x123=
54x9=
35x90=
65x11=
11x270=
mam książki matematyka z plusem .
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a)43*5= 40*5+3*5= 200+15=215
b)8*41= 8*40+8*1=320+8=328
c) 45*16=40*16+5*16=720
d) 5*123=5*100+5*23=615
e) 54*9=50*9+4*9=486
f) 35*90=30*90+5*90=3150
g) 65*11=60*10+5*10+1*60+1*5=715
h) 11*270=10*200+10*70+1*200+1*70=2970
43x5= 40x5 + 3*5=200 +15= 215
8x41=8*40 + 8*1= 320+8= 328
45x16= 45*10 + 45* 6= 450 + 270 = 720
5x123=5*120 + 5*3= 600 + 15= 615
54x9=50*9 + 4*9 = 450+ 39= 486
35x90= 30*90 + 5*90 =2700+ 450= 3150
65x11=60*11+ 5* 11= 660+ 55= 715
11x270=11* 200 + 11* 70 = 2200 + 770= 2970