Adding till 100

Calculate:

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

32	+	31	=
22	+	21	=
10	+	15	=
30	+	11	=
35	+	25	=
18	+	16	=
22	+	27	=
16	+	20	=
22	+	18	=
16	+	35	=