Subtract till 400

Calculate:

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

288	-	37	=
292	-	87	=
371	-	197	=
277	-	193	=
83	-	48	=
393	-	130	=
228	-	37	=
38	-	29	=
194	-	159	=
214	-	111	=