Subtract till 400

Calculate:

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

256	-	197	=
366	-	109	=
353	-	142	=
304	-	162	=
261	-	72	=
82	-	41	=
152	-	82	=
76	-	41	=
287	-	86	=
191	-	153	=