Subtract till 400

Calculate:

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

72	-	14	=
229	-	136	=
190	-	122	=
244	-	41	=
217	-	120	=
400	-	29	=
172	-	141	=
163	-	39	=
387	-	103	=
292	-	138	=