Subtract till 400

Calculate:

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

257	-	55	=
232	-	54	=
244	-	31	=
213	-	151	=
50	-	37	=
212	-	94	=
91	-	55	=
302	-	23	=
141	-	139	=
391	-	114	=