Adding till 400

Calculate:

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

124	+	84	=
162	+	169	=
84	+	58	=
215	+	97	=
79	+	80	=
239	+	135	=
55	+	166	=
1	+	4	=
35	+	38	=
13	+	3	=