Subtract till 400

Calculate:

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

212	-	43	=
225	-	12	=
365	-	180	=
238	-	72	=
361	-	153	=
323	-	5	=
345	-	131	=
195	-	171	=
289	-	129	=
309	-	70	=