Adding till 400

Calculate:

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

110	+	207	=
195	+	87	=
58	+	91	=
138	+	116	=
131	+	138	=
97	+	72	=
207	+	97	=
215	+	178	=
63	+	86	=
144	+	107	=