(3)5-4=
(4)9-8=
(5)2-2=
(6)6-2=
(7)7-3=
(8)3-2=
(9)7-4=
48-30=
57-6=
47-6=
59-30=
69-40=
75-3=
75+4=
56-30=
34-3=
87-6=
74-2=
78-60=
34-30=
78-6=
74+2=
75-3=
88-5=
56-4=
89-7=
46-20=
69-40=
47-3=
38-7=
84-4=
63-60=
49-4=
94-70=
39-3=
71-30=
57-30=
49-5=
97-60=
47-3=