Subtract till 400

Calculate:

Number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

337	-	195	=
340	-	37	=
61	-	29	=
321	-	72	=
305	-	122	=
354	-	65	=
164	-	147	=
171	-	11	=
122	-	110	=
58	-	23	=