Adding till 400

Calculate:

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

199	+	179	=
126	+	51	=
72	+	91	=
24	+	28	=
30	+	27	=
149	+	129	=
134	+	131	=
44	+	68	=
38	+	28	=
131	+	172	=