Adding till 400

Calculate:

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

139	+	179	=
113	+	162	=
98	+	83	=
132	+	223	=
152	+	156	=
237	+	99	=
77	+	89	=
22	+	35	=
10	+	8	=
148	+	96	=