Adding till 100

Calculate:

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

22	+	23	=
33	+	32	=
53	+	46	=
27	+	23	=
40	+	45	=
18	+	16	=
4	+	4	=
58	+	33	=
18	+	24	=
6	+	6	=