Clasa a III, va rog ajutor

3 x 300 = 3 x 3 x 100
= 9 x 100
= 900
2 x 300 = 2 x 3 x 100
= 6 x 100
= 600
2 x 400 = 2 x 4 x 100
= 8 x 100
= 800