Adding till 100

Calculate:

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

32	+	27	=
10	+	4	=
19	+	41	=
7	+	4	=
50	+	45	=
25	+	18	=
13	+	30	=
28	+	24	=
9	+	12	=
31	+	36	=