Adding till 100

Calculate:

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

30	+	17	=
22	+	17	=
12	+	6	=
11	+	24	=
53	+	27	=
42	+	29	=
34	+	26	=
13	+	14	=
19	+	28	=
48	+	38	=