Subtract till 100

Calculate:

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

36	-	25	=
94	-	41	=
68	-	17	=
17	-	17	=
50	-	14	=
58	-	11	=
28	-	12	=
54	-	42	=
94	-	43	=
49	-	41	=