Adding till 400

Calculate:

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

134	+	165	=
216	+	178	=
11	+	11	=
163	+	125	=
32	+	33	=
136	+	111	=
77	+	46	=
52	+	61	=
77	+	100	=
140	+	169	=