Subtract till 400

Calculate:

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

167	-	31	=
170	-	96	=
144	-	9	=
91	-	90	=
385	-	130	=
314	-	146	=
356	-	16	=
292	-	82	=
288	-	69	=
399	-	86	=