Answer:
1. 20/90 ----- GCF is 10 ----- 2/9
2. 15/240 ----- GCF is 15 ----- 1/16
3. 9/100 ----- GCF is 1 ----- 9/100
4. 25/192 ----- GCF is 1 ----- 25/192
5. 451/96 ----- GCF is 1 ----- 4 67/96
6. 725/180 ----- GCF is 5 ----- 4 1/36
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