Adding till 400

Calculate:

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

87	+	126	=
192	+	157	=
109	+	200	=
26	+	17	=
87	+	144	=
121	+	149	=
106	+	191	=
198	+	196	=
136	+	129	=
30	+	26	=