《2025年速算天地数学口算心算六年级上册苏教版》

$\frac{4}{15} × \frac{5}{4}= $
$\frac{5}{9} × \frac{3}{5}= $
$12 × \frac{1}{4}= $
$\frac{3}{8} × 4= $
$\frac{3}{6} × \frac{2}{9}= $
$22 × \frac{4}{33}= $
$\frac{5}{24} × \frac{4}{5}= $
$\frac{7}{15} × \frac{5}{7}= $
$\frac{2}{3} × \frac{9}{16}= $
$\frac{7}{18} × 16= $
$\frac{7}{24} × 8= $
$\frac{4}{5} × \frac{5}{4}= $
$\frac{4}{9} × \frac{6}{19}= $
$13 × \frac{4}{13}= $
$\frac{3}{5} × 25= $
$24 × \frac{7}{16}= $
$9 × \frac{7}{81}= $
$\frac{3}{4} × 0= $
$\frac{35}{6} × \frac{6}{7}= $
$\frac{3}{5} × 25= $
$\frac{4}{9} × 18= $
$48 × \frac{7}{8}= $

答案： 解析：这些题目都是分数乘法或整数与分数的乘法口算题。
对于分数乘法，直接相乘即可，分子乘分子，分母乘分母，能约分的要约分。
对于整数与分数的乘法，整数与分子相乘，分母不变，能约分的要约分。
答案：
$\frac{4}{15} × \frac{5}{4} = \frac{1}{3}$
$\frac{5}{9} × \frac{3}{5} = \frac{1}{3}$
$12 × \frac{1}{4} = 3$
$\frac{3}{8} × 4 = \frac{3}{2}$
$\frac{3}{6} × \frac{2}{9} = \frac{1}{9}$
$22 × \frac{4}{33} = \frac{8}{3}$
$\frac{5}{24} × \frac{4}{5} = \frac{1}{6}$
$\frac{7}{15} × \frac{5}{7} = \frac{1}{3}$
$\frac{2}{3} × \frac{9}{16} = \frac{3}{8}$
$\frac{7}{18} × 16 = \frac{56}{9}$
$\frac{7}{24} × 8 = \frac{7}{3}$
$\frac{4}{5} × \frac{5}{4} = 1$
$\frac{4}{9} × \frac{6}{19} = \frac{8}{57}$
$13 × \frac{4}{13} = 4$
$\frac{3}{5} × 25 = 15$
$24 × \frac{7}{16} = \frac{21}{2}$
$9 × \frac{7}{81} = \frac{7}{9}$
$\frac{3}{4} × 0 = 0$
$\frac{35}{6} × \frac{6}{7} = 5$
$\frac{3}{5} × 25 = 15$
$\frac{4}{9} × 18 = 8$
$48 × \frac{7}{8} = 42$