Увеличь дробную часть смешанного числа (перенеси единицу): 1) 2 3/8; 2) 3 5/9; 3) 4 1/11; 4) 5 7/10; 5) 3 2/3; 6) 6 1/6; 7) 10 4/13; 8) 4 5/12; 9) 1 11/100; 10) 2 3/13; 11) 13 3/5; 12) 11 1/7; 13) 8 10/21; 14) 11 1/5; 15) 5 11/14; 16) 3 17/25; 17) 16 9/10; 18) 20 4/51.

Представляем одну целую единицу в виде неправильной дроби с тем же знаменателем и складываем с дробной частью:

1. \(2\frac{3}{8}=1+\frac{8}{8}+\frac{3}{8}=1\frac{11}{8}\);
2. \(3\frac{5}{9}=2+\frac{9}{9}+\frac{5}{9}=2\frac{14}{9}\);
3. \(4\frac{1}{11}=3+\frac{11}{11}+\frac{1}{11}=3\frac{12}{11}\);
4. \(5\frac{7}{10}=4+\frac{10}{10}+\frac{7}{10}=4\frac{17}{10}\);
5. \(3\frac{2}{3}=2+\frac{3}{3}+\frac{2}{3}=2\frac{5}{3}\);
6. \(6\frac{1}{6}=5+\frac{6}{6}+\frac{1}{6}=5\frac{7}{6}\);
7. \(10\frac{4}{13}=9+\frac{13}{13}+\frac{4}{13}=9\frac{17}{13}\);
8. \(4\frac{5}{12}=3+\frac{12}{12}+\frac{5}{12}=3\frac{17}{12}\);
9. \(1\frac{11}{100}=0+\frac{100}{100}+\frac{11}{100}=\frac{111}{100}\);
10. \(2\frac{3}{13}=1+\frac{13}{13}+\frac{3}{13}=1\frac{16}{13}\);
11. \(13\frac{3}{5}=12+\frac{5}{5}+\frac{3}{5}=12\frac{8}{5}\);
12. \(11\frac{1}{7}=10+\frac{7}{7}+\frac{1}{7}=10\frac{8}{7}\);
13. \(8\frac{10}{21}=7+\frac{21}{21}+\frac{10}{21}=7\frac{31}{21}\);
14. \(11\frac{1}{5}=10+\frac{5}{5}+\frac{1}{5}=10\frac{6}{5}\);
15. \(5\frac{11}{14}=4+\frac{14}{14}+\frac{11}{14}=4\frac{25}{14}\);
16. \(3\frac{17}{25}=2+\frac{25}{25}+\frac{17}{25}=2\frac{42}{25}\);
17. \(16\frac{9}{10}=15+\frac{10}{10}+\frac{9}{10}=15\frac{19}{10}\);
18. \(20\frac{4}{51}=19+\frac{51}{51}+\frac{4}{51}=19\frac{55}{51}\).

Ответ: \(1\frac{11}{8};\ 2\frac{14}{9};\ 3\frac{12}{11};\ 4\frac{17}{10};\ 2\frac{5}{3};\ 5\frac{7}{6};\ 9\frac{17}{13};\ 3\frac{17}{12};\ \frac{111}{100};\ 1\frac{16}{13};\ 12\frac{8}{5};\ 10\frac{8}{7};\ 7\frac{31}{21};\ 10\frac{6}{5};\ 4\frac{25}{14};\ 2\frac{42}{25};\ 15\frac{19}{10};\ 19\frac{55}{51}\).