Question

Calculează după model:
12 x 40= 46 x 30=
12 x 400= 28 x 300
22 x 80= 65 x 50 =
11 X 800 = 15 x 500 =

Model: 32*20=32*(2*10)
=(32*2)*10
=64*10
=640

Answer 1

Explicație pas cu pas:

12×400=12×(4*100)=(12*4)*100=48*100=4800

22*80=22*(8*10)=(22*8)*10=176*10=1760

11*800=11*(8*100)=(11*8)*100=88*100=8800

46*30=46*(3*10)=(46*3)*10=138*10=1380

28*300=28*(3*100)=(28*3)*100=84*100=8400

65*50=65*(5*10)=(65*5)*10=325*10=3250

15*500=15*(5*100)=(15*5)*100=75*100=7500