Subtract till 400

Calculate:

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

360	-	196	=
285	-	25	=
281	-	62	=
280	-	117	=
120	-	110	=
257	-	145	=
155	-	87	=
121	-	41	=
166	-	166	=
251	-	4	=