2026年同步练习册青岛出版社五年级数学上册青岛版五四制第34页答案
1. 先涂一涂,再计算。
(1)
$\frac{1}{4} × \frac{1}{3} = \frac{1}{(\quad) × (\quad)} = \frac{1}{(\quad)}$
(2)
$\frac{1}{3} × \frac{1}{4} = \frac{1}{$$} = \frac{1}{(\quad)}$

答案

(1)
$\frac{1}{4} × \frac{1}{3} = \frac{1}{4×3} = \frac{1}{12}$
(2)
$\frac{1}{3} × \frac{1}{4} = \frac{1}{3×4} = \frac{1}{12}$
2.直接写得数。
$\frac{1}{5} × \frac{1}{6} =$
$\frac{1}{7} × \frac{1}{3} =$
$\frac{1}{8} × \frac{1}{7} =$
$\frac{1}{8} × \frac{1}{4} =$
$\frac{1}{9} $$ \frac{1}{4} =$
$\frac{1}{5} × \frac{1}{9} =$
$\frac{1}{9} × \frac{1}{6} =$
$\frac{1}{7} × \frac{1}{6} =$
$\frac{1}{7} × \frac{1}{7} =$

答案

$\frac{1}{5} × \frac{1}{6} =\frac{1}{30}$
$\frac{1}{7} × \frac{1}{3} =\frac{1}{21}$
$\frac{1}{8} × \frac{1}{7} =\frac{1}{56}$
$\frac{1}{8} × \frac{1}{4} =\frac{1}{32}$
$\frac{1}{9} × \frac{1}{4} =\frac{1}{36}$
$\frac{1}{5} × \frac{1}{9} =\frac{1}{45}$
$\frac{1}{9} × \frac{1}{6} =\frac{1}{54}$
$\frac{1}{7} × \frac{1}{6} =\frac{1}{42}$
$\frac{1}{7} × \frac{1}{7} =\frac{1}{49}$
3. 计算。
$\frac{3}{8} × \frac{2}{9} =$
$\frac{11}{5} × \frac{5}{6} =$
$\frac{7}{10} × \frac{5}{21} =$
$\frac{7}{30} × \frac{6}{7} =$
$\frac{5}{72} × \frac{9}{20} =$
$\frac{9}{42} × \frac{2}{3} =$

答案

$\frac{3}{8} × \frac{2}{9} = \frac{1}{12}$
$\frac{11}{5} × \frac{5}{6} = \frac{11}{6}$
$\frac{7}{10} × \frac{5}{21} = \frac{1}{6}$
$\frac{7}{30} × \frac{6}{7} = \frac{1}{5}$
$\frac{5}{72} × \frac{9}{20} = \frac{1}{32}$
$\frac{9}{42} × \frac{2}{3} = \frac{1}{7}$
4. 看图列式。
列式:


列式:


列式:

答案

$\frac{1}{2} × \frac{1}{3} = \frac{1}{6}$
$\frac{2}{3} × \frac{3}{4} = \frac{1}{2}$
$\frac{1}{2} × \frac{3}{5} = \frac{3}{10}$
5.在○里填上 “>” “<” 或 “=”。
$\frac{1}{8} × \frac{3}{4}$ ○ $\frac{1}{8}$
$\frac{1}{9} × \frac{3}{2}$ ○ $\frac{1}{9}$
$\frac{1}{7} × \frac{5}{6}$ ○ $\frac{1}{7}$
$\frac{1}{15} × \frac{3}{7}$ ○ $\frac{1}{15}$
$\frac{1}{7} × \frac{7}{3}$ ○ $\frac{1}{7}$
$\frac{1}{11} × \frac{5}{2}$ ○ $\frac{1}{11}$
比一比,你有什么发现?

答案

$\frac{1}{8} × \frac{3}{4}$ < $\frac{1}{8}$
$\frac{1}{9} × \frac{3}{2}$ > $\frac{1}{9}$
$\frac{1}{7} × \frac{5}{6}$ < $\frac{1}{7}$
$\frac{1}{15} × \frac{3}{7}$ < $\frac{1}{15}$
$\frac{1}{7} × \frac{7}{3}$ > $\frac{1}{7}$
$\frac{1}{11} × \frac{5}{2}$ > $\frac{1}{11}$
发现:一个不为0的数乘小于1的分数,得到的积小于这个数;乘大于1的分数,得到的积大于这个数。
6.小丽给宠物狗一家做衣服,狗宝宝用去布料$\frac{3}{10}$米,狗妈妈比狗宝宝多用布料$\frac{1}{5}$米,狗爸爸所用布料是狗宝宝的2倍。
(1)狗妈妈用去布料多少米?
(2)狗爸爸用去布料多少米?

答案

(1)
$\frac{3}{10} + \frac{1}{5} = \frac{3}{10} + \frac{2}{10} = \frac{1}{2}$(米)
(2)
$\frac{3}{10} × 2 = \frac{3}{5}$(米)
答:狗妈妈用去布料$\frac{1}{2}$米,狗爸爸用去布料$\frac{3}{5}$米。