Question

12 Efectuează, după model:
12 x 7 = (10 x 7) + (2 x 7) = 70 + 14 = 84
14 x 5
13 x 6 72 x 3
16 x 4
34 x 8
28 x 2
19 x 9
5 x 68
9 x 75​

Answer 1

14×5=(10×5)+(4×5)=50+20=70

13×6=(10×6)+(3×6)=60+18=78

72×3=(70×3)+(2×3)=210+6=216

34×8=(30×8)+(4×8)=240+32=272

28×2=(20×2)+(8×2)=40+16=56

19×9=(10×9)+(9×9)=90+81=171

5×68=(2×68)+(3×68)=136+204=340

9×75=(4×75)+(5×75)=300+375=675