Adding till 400

Calculate:

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

119	+	158	=
125	+	172	=
58	+	61	=
218	+	169	=
11	+	17	=
188	+	206	=
14	+	30	=
202	+	122	=
154	+	208	=
32	+	20	=