Adding till 400

Calculate:

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

97	+	54	=
124	+	102	=
62	+	65	=
164	+	131	=
107	+	96	=
224	+	154	=
53	+	50	=
36	+	23	=
121	+	116	=
158	+	187	=