《2025年文墨小学数学口算心算天天练五年级下册人教版》

① $\frac{1}{2} - \frac{1}{10} =$

答案： $\frac{1}{2} - \frac{1}{10} = \frac{5}{10} - \frac{1}{10} = \frac{4}{10} = \frac{2}{5}$

② $3 + \frac{1}{3} =$

答案： $3 + \frac{1}{3} = \frac{10}{3}$

③ $\frac{4}{21} × 3 =$

答案： $\frac{4}{21} × 3 = \frac{12}{21} = \frac{4}{7}$

④ $\frac{1}{5} × \frac{5}{9} =$

答案： $\frac{1}{5} × \frac{5}{9} = \frac{1}{9}$

⑤ $36 × \frac{11}{12} =$

答案： $36 × \frac{11}{12} = 3 × 11 = 33$

⑥ $\frac{5}{9} × \frac{3}{7} =$

答案： $\frac{5}{9} × \frac{3}{7} = \frac{15}{63} = \frac{5}{21}$

⑦ $50 × (\frac{2}{5} - \frac{1}{3}) =$

答案： $\frac{2}{5} - \frac{1}{3} = \frac{6}{15} - \frac{5}{15} = \frac{1}{15}$，$50 × \frac{1}{15} = \frac{10}{3}$

⑧ $13 × \frac{5}{26} =$

答案： $13 × \frac{5}{26} = \frac{5}{2}$

⑨ $\frac{7}{10} × \frac{5}{7} =$

答案： $\frac{7}{10} × \frac{5}{7} = \frac{1}{2}$

⑩ $25 × \frac{27}{50} =$

答案： $25 × \frac{27}{50} = \frac{27}{2}$

⑪ $7 + \frac{4}{9} =$

答案： $7 + \frac{4}{9} = \frac{67}{9}$

⑫ $\frac{2}{15} × \frac{1}{2} × \frac{5}{11} =$

答案： $\frac{2}{15} × \frac{1}{2} = \frac{1}{15}$，$\frac{1}{15} × \frac{5}{11} = \frac{1}{33}$

⑬ $23 - 23 × \frac{1}{2} =$

答案： $23 × (1 - \frac{1}{2}) = 23 × \frac{1}{2} = \frac{23}{2}$

⑭ $\frac{7}{15} × 90 =$

答案： $\frac{7}{15} × 90 = 7 × 6 = 42$

⑮ $13 × \frac{1}{18} =$

答案： $13 × \frac{1}{18} = \frac{13}{18}$

⑯ $\frac{1}{6} - \frac{1}{9} =$

答案： $\frac{1}{6} - \frac{1}{9} = \frac{3}{18} - \frac{2}{18} = \frac{1}{18}$

⑰ $\frac{3}{20} × \frac{2}{15} =$

答案： $\frac{3}{20} × \frac{2}{15} = \frac{6}{300} = \frac{1}{50}$

⑱ $\frac{7}{8} + \frac{1}{8} =$

答案： $\frac{7}{8} + \frac{1}{8} = 1$

⑲ $14 - \frac{6}{17} =$

答案： $14 - \frac{6}{17} = \frac{238}{17} - \frac{6}{17} = \frac{232}{17}$

⑳ $\frac{28}{29} × \frac{27}{14} × \frac{7}{9} × 0 =$

答案： $0$（任何数乘0得0）

㉑ $\frac{3}{35} × \frac{5}{9} =$

答案： $\frac{3}{35} × \frac{5}{9} = \frac{15}{315} = \frac{1}{21}$

㉒ $\frac{9}{20} × \frac{10}{11} =$

答案： $\frac{9}{20} × \frac{10}{11} = \frac{90}{220} = \frac{9}{22}$