Answer:
1. 6/18 = 1/3
9/21 = 3/7
2. 4/6 = 2/3
2/4 = 1/2
3. 6/12 = 1/2
8/12 = 2/3
4. 2/8 = 1/4
3/6 = 1/2
5. 7/21 = 1/3
8/10 = 4/5
6. 9/12 = 3/4
12/20 = 3/5
7. 8/16 = 1/2
10/25 = 2/5
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