Adding till 400

Calculate:

Number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

68	+	57	=
168	+	170	=
183	+	186	=
154	+	171	=
85	+	63	=
45	+	72	=
196	+	166	=
67	+	56	=
6	+	7	=
64	+	67	=