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1. 15 3/4*2/9 = 63/4*2/9 = 7/2 = 3 1/2 2. 3 1/8:5/3 = 25/8:5/3 = 25/8*3/5 = 15/8 = 1 7/8 3. 14:2/7 = 14:2*7 = 7*7 = 49 49-5 7/10 = 43 3/10 4. 4 2/5*4/11 = 22/5*4/11 = 8/5 3 1/5:8/5 = 16/5*5/8 = 2 5. 21*2/3 = 14 20:2/5 = 20:2*5 = 50 14/50 = 7/25