Subtract till 400

Calculate:

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

198	-	152	=
62	-	39	=
394	-	79	=
277	-	47	=
216	-	120	=
367	-	22	=
121	-	77	=
324	-	192	=
376	-	185	=
186	-	130	=