Answer:

1. 19/20 + 19/20 = 19/10

2. 24/35 + 20/25 = 52/35

3. 5/100 + 9/100 = 7/50

4. 5/7 + 8/7 = 13/7

5. 11/12 + 11/12 = 11/6

6. 2/6 + 5/6 = 7/6

7. 11/13 + 12/12 = 12/13

8. 3/5 + 4/5 = 7/5

9. 7/11 + 5/11 = 12/11

10. 8/10 + 5/10 = 13/10

Step-by-step explanation:

To solve these arithmetic expressions, we'll add the fractions together. Here are the solutions:

1. 19/20 + 19/20 = 38/20 = 19/10

2. 24/35 + 20/25 = 120/175 + 140/175 = 260/175 = 52/35

3. 5/100 + 9/100 = 14/100 = 7/50

4. 5/7 + 8/7 = 13/7

5. 11/12 + 11/12 = 22/12 = 11/6

6. 2/6 + 5/6 = 7/6

7. 11/13 + 12/12 = 11/13 + 1 = 12/13

8. 3/5 + 4/5 = 7/5 = 1 2/5

9. 7/11 + 5/11 = 12/11

10. 8/10 + 5/10 = 13/10 = 1 3/10

Note: In some cases, the fractions can be simplified further, but I presented the results in their simplest form.