Adding till 400

Calculate:

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

41	+	25	=
149	+	164	=
6	+	4	=
25	+	13	=
54	+	140	=
169	+	142	=
130	+	156	=
238	+	137	=
65	+	47	=
28	+	29	=