《2025年口算训练六年级数学上册人教版双色升级版》

$\frac {4}{9}×\frac {3}{4}=$$\frac{1}{3}$
$\frac {3}{7}×\frac {2}{5}=$$\frac{6}{35}$
$\frac {7}{9}×\frac {3}{7}=$$\frac{1}{3}$
$\frac {5}{11}×\frac {2}{3}=$$\frac{10}{33}$
$\frac {1}{4}×\frac {3}{5}=$$\frac{3}{20}$
$\frac {9}{20}×\frac {2}{3}=$$\frac{3}{10}$
$\frac {5}{7}×\frac {3}{20}=$$\frac{3}{28}$
$\frac {1}{6}×\frac {2}{5}=$$\frac{1}{15}$
$\frac {4}{9}×\frac {3}{16}=$$\frac{1}{12}$
$\frac {5}{8}×\frac {4}{15}=$$\frac{1}{6}$
$\frac {6}{7}×\frac {5}{24}=$$\frac{5}{28}$
$\frac {13}{36}×\frac {4}{39}=$$\frac{1}{27}$
$\frac {3}{40}×\frac {8}{15}=$$\frac{1}{25}$

答案： 解析：
这些题目都是分数乘法的基础练习。分数乘法的一般步骤是：直接将两个分数的分子相乘得到新的分子，两个分数的分母相乘得到新的分母。最后，要进行约分，将分数化为最简形式。
答案：
$\frac{4}{9} × \frac{3}{4} = \frac{1}{3}$；
$\frac{3}{7} × \frac{2}{5} = \frac{6}{35}$；
$\frac{7}{9} × \frac{3}{7} = \frac{1}{3}$；
$\frac{5}{11} × \frac{2}{3} = \frac{10}{33}$；
$\frac{1}{4} × \frac{3}{5} = \frac{3}{20}$；
$\frac{9}{20} × \frac{2}{3} = \frac{3}{10}$；
$\frac{5}{7} × \frac{3}{20} = \frac{3}{28}$；
$\frac{1}{6} × \frac{2}{5} = \frac{1}{15}$；
$\frac{4}{9} × \frac{3}{16} = \frac{1}{12}$；
$\frac{5}{8} × \frac{4}{15} = \frac{1}{6}$；
$\frac{6}{7} × \frac{5}{24} = \frac{5}{28}$；
$\frac{13}{36} × \frac{4}{39} = \frac{1}{27}$；
$\frac{3}{40} × \frac{8}{15} = \frac{1}{25}$。

$\frac {5}{8}×3= $
$9×\frac {1}{15}= $
$\frac {3}{4}×\frac {5}{7}= $
$16×\frac {1}{12}= $
$\frac {7}{11}×\frac {3}{14}= $
$\frac {13}{24}×12= $
$\frac {8}{9}×\frac {1}{16}= $
$4×\frac {2}{3}= $
$\frac {9}{10}×\frac {5}{6}= $
$\frac {7}{22}×3= $
$6×\frac {2}{5}= $
$12×\frac {7}{18}= $
$8×\frac {2}{7}= $

答案： 解析：
这些题目都是分数乘法的口算题。对于分数乘法，我们直接将两个分数的分子相乘得到新的分子，分母相乘得到新的分母。如果结果可以约分，则进行约分。
答案：
$\frac{5}{8} × 3 = \frac{15}{8}$
$9 × \frac{1}{15} = \frac{3}{5}$
$\frac{3}{4} × \frac{5}{7} = \frac{15}{28}$
$16 × \frac{1}{12} = \frac{4}{3}$
$\frac{7}{11} × \frac{3}{14} = \frac{3}{22}$
$\frac{13}{24} × 12 = \frac{13}{2}$
$\frac{8}{9} × \frac{1}{16} = \frac{1}{18}$
$4 × \frac{2}{3} = \frac{8}{3}$
$\frac{9}{10} × \frac{5}{6} = \frac{3}{4}$
$\frac{7}{22} × 3 = \frac{21}{22}$
$6 × \frac{2}{5} = \frac{12}{5}$
$12 × \frac{7}{18} = \frac{14}{3}$
$8 × \frac{2}{7} = \frac{16}{7}$

$\frac {3}{4}×6=$$\frac {9}{2}$
$\frac {6}{7}×4=$$\frac {24}{7}$
$19×\frac {17}{38}=$$\frac {17}{2}$
$26×\frac {5}{26}=$5
$\frac {8}{9}×6=$$\frac {16}{3}$
$\frac {1}{10}×15=$1.5
$6×\frac {1}{16}=$$\frac {3}{8}$
$\frac {4}{5}×2=$$\frac {8}{5}$
$17×\frac {8}{51}=$$\frac {8}{3}$
$\frac {3}{4}×10=$$\frac {15}{2}$
$22×\frac {7}{44}=$$\frac {7}{2}$
$\frac {5}{12}×18=$7.5
$\frac {9}{25}×5=$$\frac {9}{5}$

答案： 解析：
这些题目都是基础的分数乘法口算题，主要考察分数与整数的乘法运算。
答案：
$\frac {3}{4}×6 = \frac {18}{4} = \frac {9}{2}=4.5$；
$\frac {6}{7}×4 = \frac {24}{7}$；
$19×\frac {17}{38} = \frac {19 × 17}{38} = \frac {17}{2}=8.5$；
$26×\frac {5}{26} = 5$；
$\frac {8}{9}×6 = \frac {48}{9} = \frac {16}{3}=5\frac {1}{3}$；
$\frac {1}{10}×15 = 1.5$；
$6×\frac {1}{16} = \frac {6}{16} = \frac {3}{8}$；
$\frac {4}{5}×2 = \frac {8}{5}=1.6$；
$17×\frac {8}{51} = \frac {17 × 8}{51} = \frac {8}{3}=2\frac {2}{3}$；
$\frac {3}{4}×10 = \frac {30}{4} = \frac {15}{2}=7.5$；
$22×\frac {7}{44} = \frac {7}{2}=3.5$；
$\frac {5}{12}×18 = \frac {5 × 18}{12} = 7.5$；
$\frac {9}{25}×5 = \frac {9}{5}=1.8$。