1) 13/18 - 5/9 = (132 - 54)/(182) = (26 - 20)/36 = 6/36 = 1/62) 5/9 + 7/18 = (52 + 7)/18 = (10 + 7)/18 = 17/183) 3/5 - 1/8 = (38 - 15)/(58) = (24 - 5)/40 = 19/404) 2/5 + 7/15 = (23 + 71)/(53) = (6 + 7)/15 = 13/155) 11/14 - 1/7 = (111 - 12)/(142) = (11 - 2)/28 = 9/28 = 9/286) 7/16 + 3/8 = (71 + 32)/(162) = (7 + 6)/32 = 13/327) 9/10 - 7/9 = (99 - 710)/(109) = (81 - 70)/90 = 11/908) 5/18 + 1/9 = (51 + 12)/(182) = (5 + 2)/36 = 7/369) 2/3 - 7/16 = (216 - 73)/(3*16) = (32 - 21)/48 = 11/48
1) 13/18 - 5/9 = (132 - 54)/(182) = (26 - 20)/36 = 6/36 = 1/6
2) 5/9 + 7/18 = (52 + 7)/18 = (10 + 7)/18 = 17/18
3) 3/5 - 1/8 = (38 - 15)/(58) = (24 - 5)/40 = 19/40
4) 2/5 + 7/15 = (23 + 71)/(53) = (6 + 7)/15 = 13/15
5) 11/14 - 1/7 = (111 - 12)/(142) = (11 - 2)/28 = 9/28 = 9/28
6) 7/16 + 3/8 = (71 + 32)/(162) = (7 + 6)/32 = 13/32
7) 9/10 - 7/9 = (99 - 710)/(109) = (81 - 70)/90 = 11/90
8) 5/18 + 1/9 = (51 + 12)/(182) = (5 + 2)/36 = 7/36
9) 2/3 - 7/16 = (216 - 73)/(3*16) = (32 - 21)/48 = 11/48