Adding till 400

Calculate:

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

170	+	173	=
39	+	44	=
213	+	151	=
52	+	53	=
13	+	5	=
20	+	22	=
112	+	87	=
32	+	46	=
31	+	14	=
39	+	16	=