Subtract till 400

Calculate:

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

326	-	4	=
151	-	124	=
196	-	160	=
152	-	48	=
390	-	120	=
301	-	118	=
304	-	146	=
204	-	159	=
393	-	131	=
90	-	2	=