Adding till 100

Calculate:

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

45	+	42	=
20	+	30	=
42	+	28	=
35	+	36	=
26	+	52	=
37	+	35	=
11	+	12	=
8	+	9	=
32	+	42	=
28	+	20	=