Adding till 400

Calculate:

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

59	+	85	=
6	+	6	=
49	+	64	=
221	+	136	=
101	+	139	=
49	+	62	=
179	+	129	=
127	+	133	=
102	+	146	=
44	+	88	=