Question

calculează după model va rog urgent dau coroană ​

Answer 1

Răspuns:

a) 3 × 30 = 3 × 3 × 10

= 9 × 10

= 90

4 × 20 = 4 × 2 × 10

= 8 × 10

= 80

b) 2 × 40 = 2 × 4 × 10

= 8 × 10

= 80

2 × 20 = 2 × 2 × 10

= 4 × 10

= 40

c) 3 × 20 = 3 × 2 × 10

= 6 × 10

= 60

2 × 30 = 2 × 3 × 10

= 6 × 10

= 60