Adding till 100

Calculate:

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

18	+	25	=
32	+	20	=
13	+	20	=
48	+	39	=
31	+	36	=
32	+	15	=
74	+	25	=
18	+	14	=
5	+	8	=
13	+	7	=