Subtract till 400

Calculate:

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

399	-	88	=
180	-	136	=
122	-	118	=
385	-	169	=
123	-	93	=
306	-	42	=
237	-	75	=
232	-	190	=
344	-	175	=
256	-	183	=