Adding till 400

Calculate:

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

91	+	143	=
91	+	144	=
29	+	33	=
82	+	162	=
80	+	50	=
222	+	144	=
106	+	221	=
148	+	141	=
76	+	59	=
119	+	111	=