Adding till 400

Calculate:

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

64	+	88	=
22	+	30	=
41	+	32	=
71	+	125	=
74	+	250	=
16	+	16	=
36	+	33	=
133	+	108	=
60	+	67	=
68	+	113	=