Adding till 400

Calculate:

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

130	+	88	=
100	+	105	=
61	+	93	=
9	+	4	=
138	+	96	=
171	+	203	=
84	+	67	=
37	+	41	=
95	+	98	=
7	+	5	=