8.12.2021

47×4=40×4+4×7=160+28=188

38×9=30×9+8×9=270+72=342

57×7=50×7+7×7=350+49=399

38×5=30×5+8×5=150+40=190 

64×8=60×8+4×8=480+32=512

64×8=60×8+4×8=480+32=512

66×9=60×9+6×9=540+54=594

94×5=90×5+4×5=450+20=470

77×8=70×8+7×8=560+56=616

99×4=90×4+9×4=360+36=396

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