Subtract till 400

Calculate:

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

231	-	146	=
322	-	145	=
139	-	27	=
75	-	39	=
211	-	49	=
368	-	92	=
371	-	44	=
386	-	160	=
321	-	184	=
200	-	7	=