Multiplication till 400

Calculate:

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

20	×	19	=
14	×	14	=
15	×	24	=
16	×	14	=
18	×	21	=
30	×	10	=
13	×	16	=
17	×	10	=
15	×	20	=
16	×	25	=