Adding till 400

Calculate:

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

30	+	39	=
68	+	36	=
125	+	144	=
48	+	45	=
76	+	123	=
133	+	203	=
125	+	119	=
4	+	5	=
54	+	81	=
214	+	152	=