Subtract till 100

Calculate:

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

26	-	15	=
82	-	33	=
72	-	40	=
11	-	8	=
54	-	43	=
80	-	18	=
92	-	44	=
65	-	14	=
94	-	15	=
64	-	29	=