Adding till 400

Calculate:

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

195	+	159	=
134	+	132	=
9	+	10	=
98	+	89	=
83	+	45	=
64	+	49	=
61	+	36	=
162	+	181	=
88	+	116	=
84	+	124	=