Adding till 400

Calculate:

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

121	+	69	=
50	+	59	=
21	+	25	=
207	+	175	=
157	+	200	=
140	+	142	=
127	+	119	=
138	+	127	=
91	+	114	=
219	+	160	=