Adding till 400

Calculate:

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

182	+	212	=
2	+	2	=
108	+	200	=
144	+	208	=
120	+	110	=
191	+	187	=
46	+	59	=
84	+	90	=
139	+	163	=
168	+	193	=