Subtract till 400

Calculate:

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

366	-	172	=
135	-	68	=
320	-	160	=
341	-	111	=
182	-	145	=
153	-	27	=
398	-	11	=
355	-	166	=
239	-	184	=
164	-	141	=