Adding till 100

Calculate:

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

15	+	12	=
38	+	43	=
34	+	38	=
43	+	49	=
47	+	43	=
22	+	37	=
44	+	39	=
12	+	10	=
32	+	29	=
39	+	50	=