Adding till 100

Calculate:

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

60	+	39	=
46	+	28	=
36	+	59	=
10	+	12	=
3	+	7	=
9	+	14	=
10	+	14	=
40	+	36	=
13	+	11	=
34	+	32	=