Adding till 400

Calculate:

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

112	+	80	=
243	+	144	=
40	+	21	=
20	+	16	=
190	+	120	=
62	+	51	=
58	+	57	=
129	+	118	=
230	+	115	=
51	+	30	=