Multiplication till 400

Calculate:

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

7	×	8	=
20	×	18	=
12	×	15	=
15	×	20	=
3	×	7	=
3	×	5	=
21	×	11	=
13	×	29	=
23	×	17	=
10	×	9	=