Answer:
1. 4/5
2. 7/10
3. 3/10
4. 2/3
Explanation:
1. 6/10 + 2/10
6 + 2 = 8
8/10 = 4/5
2. 9/20 + 5/20
9 + 5 = 14
14/20 = 7/10
3. 2/5 - 1/10
2 × 2 = 4
5 × 2 = 10
4/10 - 1/10
4 - 1 = 3
3/10
4. 5/12 + 1/4
1 × 3 = 3
4 × 3 = 12
5/12 + 3/12
5 + 3 = 8
8/12 = 2/3
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