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一、直接写出得数。
$\frac{7}{25}×\frac{15}{14}=$
$\frac{7}{50}×\frac{10}{7}=$
$\frac{9}{20}×\frac{10}{9}=$
$\frac{7}{26}×\frac{2}{3}=$
$\frac{7}{16}×\frac{32}{21}=$
$\frac{5}{6}×\frac{9}{10}=$
$\frac{7}{24}×\frac{8}{7}=$
$\frac{2}{5}×\frac{3}{4}=$
$\frac{7}{18}×\frac{1}{7}=$
$\frac{2}{3}×\frac{15}{16}=$
$\frac{5}{6}×\frac{3}{4}=$
$\frac{4}{13}×\frac{13}{16}=$
$\frac{3}{10}×\frac{5}{21}=$
$\frac{5}{12}×\frac{3}{5}=$
$\frac{9}{11}×\frac{1}{36}=$
$\frac{3}{4}×\frac{12}{25}=$
$\frac{16}{21}×\frac{7}{12}=$
$\frac{7}{12}×\frac{8}{21}=$
$\frac{8}{9}×\frac{15}{16}=$
$\frac{7}{18}×14=$
$15×\frac{5}{21}=$
$\frac{8}{15}×\frac{3}{4}=$
$\frac{2}{5}×\frac{1}{8}=$
$\frac{2}{3}×\frac{3}{4}=$
$\frac{3}{10}×\frac{5}{18}=$
$\frac{27}{8}×\frac{2}{9}=$
$\frac{6}{7}×\frac{14}{3}=$
$\frac{3}{5}×\frac{6}{5}=$
$\frac{2}{155}×5=$
$\frac{1}{10}×8=$
$\frac{2}{7}×\frac{7}{5}=$
$\frac{9}{4}×\frac{2}{3}=$
$\frac{7}{25}×\frac{15}{14}=$
$\frac{7}{50}×\frac{10}{7}=$
$\frac{9}{20}×\frac{10}{9}=$
$\frac{7}{26}×\frac{2}{3}=$
$\frac{7}{16}×\frac{32}{21}=$
$\frac{5}{6}×\frac{9}{10}=$
$\frac{7}{24}×\frac{8}{7}=$
$\frac{2}{5}×\frac{3}{4}=$
$\frac{7}{18}×\frac{1}{7}=$
$\frac{2}{3}×\frac{15}{16}=$
$\frac{5}{6}×\frac{3}{4}=$
$\frac{4}{13}×\frac{13}{16}=$
$\frac{3}{10}×\frac{5}{21}=$
$\frac{5}{12}×\frac{3}{5}=$
$\frac{9}{11}×\frac{1}{36}=$
$\frac{3}{4}×\frac{12}{25}=$
$\frac{16}{21}×\frac{7}{12}=$
$\frac{7}{12}×\frac{8}{21}=$
$\frac{8}{9}×\frac{15}{16}=$
$\frac{7}{18}×14=$
$15×\frac{5}{21}=$
$\frac{8}{15}×\frac{3}{4}=$
$\frac{2}{5}×\frac{1}{8}=$
$\frac{2}{3}×\frac{3}{4}=$
$\frac{3}{10}×\frac{5}{18}=$
$\frac{27}{8}×\frac{2}{9}=$
$\frac{6}{7}×\frac{14}{3}=$
$\frac{3}{5}×\frac{6}{5}=$
$\frac{2}{155}×5=$
$\frac{1}{10}×8=$
$\frac{2}{7}×\frac{7}{5}=$
$\frac{9}{4}×\frac{2}{3}=$
答案
1.$\frac{3}{10}$ 2.$\frac{1}{5}$ 3.$\frac{1}{2}$ 4.$\frac{7}{39}$ 5.$\frac{2}{3}$ 6.$\frac{3}{4}$ 7.$\frac{1}{3}$ 8.$\frac{3}{10}$ 9.$\frac{1}{18}$ 10.$\frac{5}{8}$
11.$\frac{5}{8}$ 12.$\frac{1}{4}$ 13.$\frac{1}{14}$ 14.$\frac{1}{4}$ 15.$\frac{1}{44}$ 16.$\frac{9}{25}$ 17.$\frac{4}{9}$ 18.$\frac{2}{9}$ 19.$\frac{5}{6}$ 20.$\frac{49}{9}$
21.$\frac{25}{7}$ 22.$\frac{2}{5}$ 23.$\frac{1}{20}$ 24.$\frac{1}{2}$ 25.$\frac{1}{12}$ 26.$\frac{3}{4}$ 27.$4$ 28.$\frac{18}{25}$ 29.$\frac{2}{31}$ 30.$\frac{4}{5}$
31.$\frac{2}{5}$ 32.$\frac{3}{2}$
11.$\frac{5}{8}$ 12.$\frac{1}{4}$ 13.$\frac{1}{14}$ 14.$\frac{1}{4}$ 15.$\frac{1}{44}$ 16.$\frac{9}{25}$ 17.$\frac{4}{9}$ 18.$\frac{2}{9}$ 19.$\frac{5}{6}$ 20.$\frac{49}{9}$
21.$\frac{25}{7}$ 22.$\frac{2}{5}$ 23.$\frac{1}{20}$ 24.$\frac{1}{2}$ 25.$\frac{1}{12}$ 26.$\frac{3}{4}$ 27.$4$ 28.$\frac{18}{25}$ 29.$\frac{2}{31}$ 30.$\frac{4}{5}$
31.$\frac{2}{5}$ 32.$\frac{3}{2}$
二、算一算，并观察这些算式，你发现了什么？
$\frac{7}{10} × \frac{5}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{6}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{7}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{8}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{9}{7} = \_\_\_\_\_\_$
我发现：
$\frac{7}{10} × \frac{5}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{6}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{7}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{8}{7} = \_\_\_\_\_\_$
$\frac{7}{10} × \frac{9}{7} = \_\_\_\_\_\_$
我发现：
答案
1.$\frac{1}{2}$ 2.$\frac{3}{5}$ 3.$\frac{7}{10}$ 4.$\frac{4}{5}$ 5.$\frac{9}{10}$
我发现:一个数(0除外)乘小于1且大于0的数时,积比原数小;乘1时,积等于原数;乘大于1的数时,积比原数大。(发现不唯一)
我发现:一个数(0除外)乘小于1且大于0的数时,积比原数小;乘1时,积等于原数;乘大于1的数时,积比原数大。(发现不唯一)
三、实验班原创 推理意识 括号里最大能填多少？（填整数）
$\frac{3}{20}×\frac{4}{5}＜\frac{3}{( )}$
$\frac{( )}{8}×\frac{4}{7}＜\frac{7}{8}$
$\frac{9}{11}×\frac{( )}{5}＜1$
$\frac{7}{8}×\frac{4}{5}＜\frac{7}{( )}$
$\frac{5}{7}×\frac{( )}{4}＜\frac{6}{7}$
$\frac{5}{6}×\frac{6}{11}＞\frac{( )}{11}$
扫码听算
1. 2. 3. 4.
5. 6. 7. 8.
$\frac{3}{20}×\frac{4}{5}＜\frac{3}{( )}$
$\frac{( )}{8}×\frac{4}{7}＜\frac{7}{8}$
$\frac{9}{11}×\frac{( )}{5}＜1$
$\frac{7}{8}×\frac{4}{5}＜\frac{7}{( )}$
$\frac{5}{7}×\frac{( )}{4}＜\frac{6}{7}$
$\frac{5}{6}×\frac{6}{11}＞\frac{( )}{11}$
扫码听算
1. 2. 3. 4.
5. 6. 7. 8.
答案
1.24 2.12 3.6 4.9 5.4 6.4
