Subtract till 400

Calculate:

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

315	-	184	=
327	-	70	=
317	-	71	=
303	-	75	=
347	-	142	=
205	-	102	=
343	-	95	=
55	-	4	=
378	-	139	=
250	-	12	=