Multiplication till 20

Calculate:

The number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

2	×	1	=
3	×	5	=
2	×	2	=
1	×	1	=
2	×	6	=
5	×	4	=
2	×	3	=
3	×	2	=
3	×	3	=
1	×	2	=