Subtract till 400

Calculate:

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

337	-	191	=
175	-	54	=
145	-	2	=
349	-	12	=
261	-	186	=
148	-	104	=
329	-	161	=
197	-	139	=
224	-	77	=
95	-	93	=