Subtract till 400

Calculate:

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

240	-	183	=
59	-	46	=
258	-	181	=
203	-	197	=
192	-	81	=
302	-	144	=
329	-	115	=
258	-	176	=
366	-	160	=
172	-	83	=