Adding till 100

Calculate:

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

36	+	46	=
19	+	15	=
2	+	3	=
24	+	31	=
15	+	28	=
41	+	47	=
1	+	4	=
26	+	44	=
38	+	42	=
17	+	25	=