Adding till 100

Calculate:

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

28	+	34	=
10	+	6	=
10	+	10	=
24	+	32	=
13	+	22	=
16	+	26	=
44	+	54	=
33	+	40	=
46	+	44	=
32	+	42	=