Subtract till 400

Calculate:

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

183	-	71	=
337	-	93	=
184	-	33	=
164	-	149	=
294	-	93	=
223	-	37	=
355	-	17	=
251	-	139	=
54	-	15	=
200	-	192	=