Adding till 400

Calculate:

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

149	+	178	=
139	+	213	=
162	+	80	=
91	+	87	=
26	+	24	=
80	+	125	=
175	+	135	=
207	+	160	=
178	+	186	=
6	+	7	=