Multiplication till 400

Calculate:

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

13	×	12	=
22	×	17	=
23	×	16	=
10	×	6	=
20	×	19	=
21	×	18	=
19	×	19	=
21	×	13	=
3	×	8	=
3	×	3	=