8\25+17\20 = \frac{8}{25} + \frac{17}{20} = \frac{32}{100} + \frac{85}{100} = \frac{117}{100} = 1\frac{17}{100}
4\45-1\30 = \frac{4}{45} - \frac{1}{30} = \frac{8}{90} - \frac{3}{90} = \frac{5}{90} = \frac{1}{18}
17\18-11\12 = \frac{17}{18} - \frac{11}{12} = \frac{68}{72} - \frac{66}{72} = \frac{2}{72} = \frac{1}{36}
11\15+5\12 = \frac{11}{15} + \frac{5}{12} = \frac{44}{60} + \frac{25}{60} = \frac{69}{60} = 1\frac{9}{60} = 1\frac{3}{20}
1\3+1\6 = \frac{1}{3} + \frac{1}{6} = \frac{2}{6} + \frac{1}{6} = \frac{3}{6} = \frac{1}{2} = 0\frac{1}{2}
3\4-2\5 = \frac{3}{4} - \frac{2}{5} = \frac{15}{20} - \frac{8}{20} = \frac{7}{20} = 0\frac{7}{20}
8\25+17\20 = \frac{8}{25} + \frac{17}{20} = \frac{32}{100} + \frac{85}{100} = \frac{117}{100} = 1\frac{17}{100}
4\45-1\30 = \frac{4}{45} - \frac{1}{30} = \frac{8}{90} - \frac{3}{90} = \frac{5}{90} = \frac{1}{18}
17\18-11\12 = \frac{17}{18} - \frac{11}{12} = \frac{68}{72} - \frac{66}{72} = \frac{2}{72} = \frac{1}{36}
11\15+5\12 = \frac{11}{15} + \frac{5}{12} = \frac{44}{60} + \frac{25}{60} = \frac{69}{60} = 1\frac{9}{60} = 1\frac{3}{20}
1\3+1\6 = \frac{1}{3} + \frac{1}{6} = \frac{2}{6} + \frac{1}{6} = \frac{3}{6} = \frac{1}{2} = 0\frac{1}{2}
3\4-2\5 = \frac{3}{4} - \frac{2}{5} = \frac{15}{20} - \frac{8}{20} = \frac{7}{20} = 0\frac{7}{20}