1. 20/40 + 12/40
= 32/40
= 4/5
2. 7/12 + 3/12
= 10/12
= 5/6
3. 6/10 + 3/10
= 9/10
4. 8/40 + 5/40
= 13/40
5. 3/4 + 2/4
= 5/4
= 1 1/4
6. 3/4 - 2/4
= 1/4
7. 20/36 - 9/36
= 11/36
8. 9/12 - 6/12
= 3/12
9. 12/15 - 10/15
= 2/15
10. 7/10 - 6/10
= 1/10
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Answers & Comments
1. 20/40 + 12/40
= 32/40
= 4/5
2. 7/12 + 3/12
= 10/12
= 5/6
3. 6/10 + 3/10
= 9/10
4. 8/40 + 5/40
= 13/40
5. 3/4 + 2/4
= 5/4
= 1 1/4
6. 3/4 - 2/4
= 1/4
7. 20/36 - 9/36
= 11/36
8. 9/12 - 6/12
= 3/12
= 1/4
9. 12/15 - 10/15
= 2/15
10. 7/10 - 6/10
= 1/10