Adding till 400

Calculate:

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

120	+	169	=
132	+	159	=
14	+	15	=
196	+	160	=
220	+	160	=
39	+	63	=
113	+	120	=
199	+	150	=
129	+	92	=
78	+	44	=