Subtract till 100

Calculate:

Number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

58	-	27	=
57	-	45	=
52	-	20	=
95	-	44	=
93	-	17	=
49	-	26	=
76	-	38	=
49	-	17	=
23	-	20	=
94	-	41	=