Subtract till 100

Calculate:

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

100	-	43	=
27	-	26	=
89	-	14	=
56	-	34	=
70	-	17	=
47	-	19	=
40	-	32	=
58	-	28	=
99	-	49	=
22	-	17	=