Adding till 100

Calculate:

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

4	+	4	=
10	+	8	=
14	+	23	=
4	+	2	=
32	+	61	=
11	+	28	=
35	+	45	=
6	+	11	=
8	+	4	=
39	+	58	=