Subtract till 400

Calculate:

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

234	-	125	=
183	-	45	=
371	-	127	=
278	-	6	=
288	-	64	=
193	-	36	=
202	-	118	=
357	-	82	=
382	-	86	=
170	-	31	=