Adding till 400

Calculate:

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

135	+	117	=
95	+	90	=
172	+	144	=
89	+	133	=
66	+	42	=
41	+	56	=
171	+	149	=
19	+	32	=
139	+	108	=
29	+	43	=