Adding till 100

Calculate:

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

30	+	61	=
41	+	59	=
15	+	14	=
11	+	12	=
8	+	6	=
4	+	3	=
18	+	13	=
35	+	43	=
40	+	42	=
37	+	22	=