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Answer:

1. 5/8 + 1/2

5/8 + 1×4/2×4

5/8 + 4/8

= 9/8 or 1 1/8

2. 3/4 - 1/3

3×3/4×3 - 1×4/3×4

9/12 - 4/12

= 5/12

3. 6/9 - 2/3

6÷3/9÷3 - 2/3

2/3 - 2/3

= 0

4. 5/6 - 1/4

5×2/6×2 - 1×3/4×3

10/12 - 3/12

= 7/12

5. 3/5 + 1/2

3×2/5×2 + 1×5/2×5

6/10 + 5/10

= 11/10 or 1 1/10

6. 9/10 - 2/5

9/10 - 2×2/5×2

9/10 - 4/10

5/10 ÷ 5/5

= 1/2

7. 4/5 - 1/2

4×2/5×2 - 1×5/2×5

8/10 - 5/10

= 3/10

8. 11/12 - 5/6

11/12 - 5×2/6×2

11/12 - 10/12

= 1/12

9. 4/10 - 3/5

4÷2/10÷2 - 3/5

2/5 - 3/5

= -1/5

10. 7/9 - 2/3

7/9 - 2×3/3×3

7/9 - 6/9

= 1/9