Adding till 400

Calculate:

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

120	+	199	=
40	+	40	=
59	+	78	=
182	+	80	=
26	+	21	=
182	+	99	=
48	+	48	=
211	+	129	=
58	+	43	=
192	+	119	=