Adding till 100

Calculate:

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

38	+	33	=
8	+	9	=
33	+	62	=
28	+	24	=
53	+	38	=
7	+	6	=
13	+	8	=
8	+	4	=
52	+	44	=
24	+	30	=