(1).. 7/10 + 1/10 = 8/10 = 4/5 (2).. 5/9 + 4/9 = 9/9 = 1 (3).. 8/15 + 3/15 = 11/15 (4).. 9/14 + 3/14 = 12/14 = 6/7 (5).. 3/5 + 8/5 = 11/5 (6).. 4/15 - 3/15 = 1/15 (7).. 7/8 - 5/8 = 2/8 = 1/4 (8).. 5/3 - 2/3 = 3/3 =1 (9).. 7/8 - 4/8 = 3/8 (10).. 1314/2010- 520/2010 = 794/2010 = 397/1005
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