Adding till 400

Calculate:

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

89	+	80	=
108	+	154	=
222	+	166	=
75	+	154	=
127	+	104	=
188	+	119	=
74	+	132	=
162	+	156	=
31	+	24	=
106	+	116	=