Subtract till 400

Calculate:

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

370	-	48	=
61	-	19	=
174	-	65	=
252	-	190	=
335	-	70	=
88	-	29	=
241	-	133	=
379	-	137	=
201	-	80	=
278	-	125	=