Adding till 100

Calculate:

Number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

34	+	38	=
43	+	33	=
20	+	10	=
22	+	26	=
28	+	22	=
9	+	12	=
9	+	11	=
47	+	37	=
19	+	17	=
29	+	23	=