7*4-3*5 3*6+3*7 7*7-4*5 9*4+5*7 9*8-7*8 9*5-4*4 6*7-5*5 9*9-7*6 8*5+6*4

Question

7*4-3*5
3*6+3*7
7*7-4*5
9*4+5*7
9*8-7*8
9*5-4*4
6*7-5*5
9*9-7*6
8*5+6*4

Answer 1

1. 28-15=13
2. 18+21=39
3. 49-20=29
4. 36+35=71
5. 72-56=16
6. 45-16=29
7. 42-25=17
8. 81-42=39
9. 40+24=64