Adding till 400

Calculate:

The number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

171	+	126	=
87	+	98	=
203	+	150	=
21	+	25	=
32	+	45	=
193	+	152	=
157	+	161	=
103	+	103	=
62	+	66	=
143	+	40	=