Subtract till 100

Calculate:

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

40	-	10	=
47	-	2	=
96	-	44	=
79	-	42	=
88	-	43	=
96	-	48	=
76	-	32	=
58	-	34	=
71	-	4	=
86	-	3	=