Adding till 400

Calculate:

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

166	+	200	=
11	+	8	=
133	+	176	=
174	+	201	=
40	+	12	=
162	+	176	=
140	+	115	=
91	+	116	=
19	+	14	=
42	+	49	=