Multiplication till 400

Calculate:

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

22	×	18	=
19	×	16	=
10	×	9	=
13	×	17	=
14	×	15	=
3	×	13	=
14	×	18	=
21	×	19	=
9	×	8	=
12	×	10	=