Subtract till 400

Calculate:

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

133	-	117	=
188	-	187	=
43	-	28	=
267	-	21	=
358	-	128	=
228	-	182	=
374	-	154	=
396	-	86	=
254	-	115	=
109	-	22	=