2. Efectuează:
43 x 2 =
24 x 2 =
31 x 3 =
12 x 4 =
11 x 5 =
32 x 3 =
22 x 4 =
11 x 4 =
33 x 2 =
33 x 3 =
44 x2=
4421
31 x 4 =
23 x 3 =
42 x 2 =
22 x 2 =​