Question

1.Calculează după model: 6 x 40 = 6 x 4 x 10-24 x 10 = 240 9 x 50= 7 x 80- 4 x 90- 2. Rezolvă direct: 80 x 5= 50 x 7 = 90 x 9= 60 x 6= 3 Efectuează după model: 70 x 9-7x10x9-7x9x 10-63 x 10 = 630 30 x 8 = 60 x 7= 80 x 6 = 4 x 60 = 9 x 40 = 2 x 70 = 8 x 80 = 70 x 4 = 30 x 8- 80 x 70 x 6 = 8 = 3 x 50-> 6 x 70- 4 x 50- 6x90=>​

Answer 1

Explicație pas cu pas:

1.

9 × 50 = 9 × 5 × 10 = 45 × 10 = 450

7 × 80 = 7 × 8 × 10 = 56 × 10 = 560

4 × 90 = 4 × 9 × 10 = 36 × 10 = 360

2.

80 × 5 = 400

50 × 7 = 350

90 × 9 = 810

60 × 6 = 360

3.

30 × 8 = 3 × 10 × 8 = 3 × 8 × 10 = 24 × 10 = 240

60 × 7 = 6 × 10 × 7 = 6 × 7 × 10 = 42 × 10 = 420

80 × 6 = 8 × 10 × 6 = 8 × 6 × 10 = 48 × 10 = 480

4 × 60 = 4 × 10 × 6 = 4 × 6 × 10 = 24 × 10 = 240

9 × 40 = 9 × 10 × 4 = 9 × 4 × 10 = 36 × 10 = 360

2 × 70 = 2 × 10 × 7 = 2 × 7 × 10 = 14 × 10 = 140

8 × 80 = 8 × 10 × 8 = 8 × 8 × 10 = 64 × 10 = 640

70 × 4 = 7 × 10 × 4 = 7 × 4 × 10 = 28 × 10 = 280

30 × 8 = 3 × 10 × 8 = 3 × 8 × 10 = 24 × 10 = 240

3 × 50 = 3 × 10 × 5 = 3 × 5 × 10 = 15 × 10 = 150

6 × 70 = 6 × 10 × 7 = 6 × 7 × 10 = 42 × 10 = 420

4 × 50 = 4 × 10 × 5 = 4 × 5 × 10 = 20 × 10 = 200

6 × 90 = 6 × 10 × 9 = 6 × 9 × 10 = 54 × 10 = 540

Sper că ți-am fost de ajutor! :)