Subtract till 100

Calculate:

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

89	-	43	=
81	-	34	=
93	-	29	=
71	-	34	=
65	-	39	=
87	-	42	=
43	-	36	=
32	-	15	=
48	-	34	=
97	-	36	=