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五年级下册分数加减简便计算专项练习

五年级下册分数加减简便计算专项练习 完成时间：_______ 分钟 得分：_______ 简便计算（共20题） 用简便方法计算下列各题： 1. 5 8 + 7 12 + 3 8 \frac{5}{8} + \frac{7}{12} + \frac{3}{8} 8 5 + 12 7 + 8 3 2. 9 10 − 2 7 − 5 7 \frac{9}{10}

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五年级下册分数加减简便计算专项练习


完成时间：_______ 分钟 得分：_______




简便计算（共20题）

用简便方法计算下列各题：


1. 58+712+38\frac{5}{8} + \frac{7}{12} + \frac{3}{8}

2. 910−27−57\frac{9}{10} - \frac{2}{7} - \frac{5}{7}

3. 1115+49+415+59\frac{11}{15} + \frac{4}{9} + \frac{4}{15} + \frac{5}{9}

4. 1314−(514−38)\frac{13}{14} - (\frac{5}{14} - \frac{3}{8})

5. 76−512+56−712\frac{7}{6} - \frac{5}{12} + \frac{5}{6} - \frac{7}{12}

6. 89+56−79\frac{8}{9} + \frac{5}{6} - \frac{7}{9}

7. 1720−38−15\frac{17}{20} - \frac{3}{8} - \frac{1}{5}

8. 57+25+27+35\frac{5}{7} + \frac{2}{5} + \frac{2}{7} + \frac{3}{5}

9. 213+57+1232\frac{1}{3} + \frac{5}{7} + 1\frac{2}{3}

10. 910−(310+14)\frac{9}{10} - (\frac{3}{10} + \frac{1}{4})

11. 45+713+15+613\frac{4}{5} + \frac{7}{13} + \frac{1}{5} + \frac{6}{13}

12. 358−712−1583\frac{5}{8} - \frac{7}{12} - 1\frac{5}{8}

13. 1112+58−712+38\frac{11}{12} + \frac{5}{8} - \frac{7}{12} + \frac{3}{8}

14. 89−25+19−35\frac{8}{9} - \frac{2}{5} + \frac{1}{9} - \frac{3}{5}

15. 78−512+18−112\frac{7}{8} - \frac{5}{12} + \frac{1}{8} - \frac{1}{12}

16. 427−(127+56)4\frac{2}{7} - (1\frac{2}{7} + \frac{5}{6})

17. 1315+711+215+411\frac{13}{15} + \frac{7}{11} + \frac{2}{15} + \frac{4}{11}

18. 5310−2712−13105\frac{3}{10} - 2\frac{7}{12} - 1\frac{3}{10}

19. 56+37−16+47\frac{5}{6} + \frac{3}{7} - \frac{1}{6} + \frac{4}{7}

20. 1920−713−613+120\frac{19}{20} - \frac{7}{13} - \frac{6}{13} + \frac{1}{20}

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参考答案

1. 58+712+38=(58+38)+712=1+712=1712\frac{5}{8} + \frac{7}{12} + \frac{3}{8} = (\frac{5}{8} + \frac{3}{8}) + \frac{7}{12} = 1 + \frac{7}{12} = 1\frac{7}{12}

2. 910−27−57=910−(27+57)=910−1=−110\frac{9}{10} - \frac{2}{7} - \frac{5}{7} = \frac{9}{10} - (\frac{2}{7} + \frac{5}{7}) = \frac{9}{10} - 1 = -\frac{1}{10}

3. 1115+49+415+59=(1115+415)+(49+59)=1+1=2\frac{11}{15} + \frac{4}{9} + \frac{4}{15} + \frac{5}{9} = (\frac{11}{15} + \frac{4}{15}) + (\frac{4}{9} + \frac{5}{9}) = 1 + 1 = 2

4. 1314−(514−38)=1314−514+38=814+38=47+38=3256+2156=5356\frac{13}{14} - (\frac{5}{14} - \frac{3}{8}) = \frac{13}{14} - \frac{5}{14} + \frac{3}{8} = \frac{8}{14} + \frac{3}{8} = \frac{4}{7} + \frac{3}{8} = \frac{32}{56} + \frac{21}{56} = \frac{53}{56}

5. 76−512+56−712=(76+56)−(512+712)=2−1=1\frac{7}{6} - \frac{5}{12} + \frac{5}{6} - \frac{7}{12} = (\frac{7}{6} + \frac{5}{6}) - (\frac{5}{12} + \frac{7}{12}) = 2 - 1 = 1

6. 89+56−79=(89−79)+56=19+56=218+1518=1718\frac{8}{9} + \frac{5}{6} - \frac{7}{9} = (\frac{8}{9} - \frac{7}{9}) + \frac{5}{6} = \frac{1}{9} + \frac{5}{6} = \frac{2}{18} + \frac{15}{18} = \frac{17}{18}

7. 1720−38−15=1720−15−38=1720−420−38=1320−38=2640−1540=1140\frac{17}{20} - \frac{3}{8} - \frac{1}{5} = \frac{17}{20} - \frac{1}{5} - \frac{3}{8} = \frac{17}{20} - \frac{4}{20} - \frac{3}{8} = \frac{13}{20} - \frac{3}{8} = \frac{26}{40} - \frac{15}{40} = \frac{11}{40}

8. 57+25+27+35=(57+27)+(25+35)=1+1=2\frac{5}{7} + \frac{2}{5} + \frac{2}{7} + \frac{3}{5} = (\frac{5}{7} + \frac{2}{7}) + (\frac{2}{5} + \frac{3}{5}) = 1 + 1 = 2

9. 213+57+123=(213+123)+57=4+57=4572\frac{1}{3} + \frac{5}{7} + 1\frac{2}{3} = (2\frac{1}{3} + 1\frac{2}{3}) + \frac{5}{7} = 4 + \frac{5}{7} = 4\frac{5}{7}

10. 910−(310+14)=910−310−14=610−14=35−14=1220−520=720\frac{9}{10} - (\frac{3}{10} + \frac{1}{4}) = \frac{9}{10} - \frac{3}{10} - \frac{1}{4} = \frac{6}{10} - \frac{1}{4} = \frac{3}{5} - \frac{1}{4} = \frac{12}{20} - \frac{5}{20} = \frac{7}{20}

11. 45+713+15+613=(45+15)+(713+613)=1+1=2\frac{4}{5} + \frac{7}{13} + \frac{1}{5} + \frac{6}{13} = (\frac{4}{5} + \frac{1}{5}) + (\frac{7}{13} + \frac{6}{13}) = 1 + 1 = 2

12. 358−712−158=(358−158)−712=2−712=15123\frac{5}{8} - \frac{7}{12} - 1\frac{5}{8} = (3\frac{5}{8} - 1\frac{5}{8}) - \frac{7}{12} = 2 - \frac{7}{12} = 1\frac{5}{12}

13. 1112+58−712+38=(1112−712)+(58+38)=412+1=13+1=113\frac{11}{12} + \frac{5}{8} - \frac{7}{12} + \frac{3}{8} = (\frac{11}{12} - \frac{7}{12}) + (\frac{5}{8} + \frac{3}{8}) = \frac{4}{12} + 1 = \frac{1}{3} + 1 = 1\frac{1}{3}

14. 89−25+19−35=(89+19)−(25+35)=1−1=0\frac{8}{9} - \frac{2}{5} + \frac{1}{9} - \frac{3}{5} = (\frac{8}{9} + \frac{1}{9}) - (\frac{2}{5} + \frac{3}{5}) = 1 - 1 = 0

15. 78−512+18−112=(78+18)−(512+112)=1−612=1−12=12\frac{7}{8} - \frac{5}{12} + \frac{1}{8} - \frac{1}{12} = (\frac{7}{8} + \frac{1}{8}) - (\frac{5}{12} + \frac{1}{12}) = 1 - \frac{6}{12} = 1 - \frac{1}{2} = \frac{1}{2}

16. 427−(127+56)=427−127−56=3−56=2164\frac{2}{7} - (1\frac{2}{7} + \frac{5}{6}) = 4\frac{2}{7} - 1\frac{2}{7} - \frac{5}{6} = 3 - \frac{5}{6} = 2\frac{1}{6}

17. 1315+711+215+411=(1315+215)+(711+411)=1+1=2\frac{13}{15} + \frac{7}{11} + \frac{2}{15} + \frac{4}{11} = (\frac{13}{15} + \frac{2}{15}) + (\frac{7}{11} + \frac{4}{11}) = 1 + 1 = 2

18. 5310−2712−1310=(5310−1310)−2712=4−2712=15125\frac{3}{10} - 2\frac{7}{12} - 1\frac{3}{10} = (5\frac{3}{10} - 1\frac{3}{10}) - 2\frac{7}{12} = 4 - 2\frac{7}{12} = 1\frac{5}{12}

19. 56+37−16+47=(56−16)+(37+47)=46+1=23+1=123\frac{5}{6} + \frac{3}{7} - \frac{1}{6} + \frac{4}{7} = (\frac{5}{6} - \frac{1}{6}) + (\frac{3}{7} + \frac{4}{7}) = \frac{4}{6} + 1 = \frac{2}{3} + 1 = 1\frac{2}{3}

20. 1920−713−613+120=(1920+120)−(713+613)=1−1=0\frac{19}{20} - \frac{7}{13} - \frac{6}{13} + \frac{1}{20} = (\frac{19}{20} + \frac{1}{20}) - (\frac{7}{13} + \frac{6}{13}) = 1 - 1 = 0