Adding till 400

Calculate:

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

152	+	139	=
119	+	70	=
182	+	203	=
219	+	173	=
27	+	23	=
123	+	108	=
18	+	29	=
133	+	103	=
159	+	159	=
84	+	54	=