Adding till 400

Calculate:

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

149	+	153	=
68	+	39	=
176	+	159	=
105	+	155	=
18	+	10	=
167	+	82	=
2	+	3	=
127	+	168	=
42	+	31	=
41	+	96	=