1. 直接写出得数。
$36×\frac{1}{10}=$ $123×\frac{1}{100}=$ $85×\frac{1}{100}=$
$36×\frac{1}{100}=$ $123×\frac{1}{1000}=$ $85×\frac{1}{1000}=$
$36×\frac{1}{10}=$ $123×\frac{1}{100}=$ $85×\frac{1}{100}=$
$36×\frac{1}{100}=$ $123×\frac{1}{1000}=$ $85×\frac{1}{1000}=$
答案
$3\frac{3}{5}$
$1\frac{23}{100}$
$\frac{17}{20}$
$\frac{9}{25}$
$\frac{123}{1000}$
$\frac{17}{200}$
$1\frac{23}{100}$
$\frac{17}{20}$
$\frac{9}{25}$
$\frac{123}{1000}$
$\frac{17}{200}$
2. 计算。
$\frac{5}{14}×10=$ $\frac{9}{22}×12=$ $\frac{7}{8}×12=$
$20×\frac{8}{15}=$ $16×\frac{5}{6}=$ $36×\frac{9}{14}=$
$36×\frac{5}{6}=$ $28×\frac{4}{7}=$ $65×\frac{2}{13}=$
$\frac{5}{14}×10=$ $\frac{9}{22}×12=$ $\frac{7}{8}×12=$
$20×\frac{8}{15}=$ $16×\frac{5}{6}=$ $36×\frac{9}{14}=$
$36×\frac{5}{6}=$ $28×\frac{4}{7}=$ $65×\frac{2}{13}=$
答案
$3\frac{4}{7}$
$4\frac{10}{11}$
$10\frac{1}{2}$
$10\frac{2}{3}$
$13\frac{1}{3}$
$23\frac{1}{7}$
30
16
10
150
160
$200×\frac {3}{4}=150(\mathrm {m})$
$288×\frac {5}{9}=160(\mathrm {kg})$
$4\frac{10}{11}$
$10\frac{1}{2}$
$10\frac{2}{3}$
$13\frac{1}{3}$
$23\frac{1}{7}$
30
16
10
150
160
$200×\frac {3}{4}=150(\mathrm {m})$
$288×\frac {5}{9}=160(\mathrm {kg})$
3. 看图计算。
列式:____________________ 列式:____________________
列式:____________________ 列式:____________________
答案
4. 用简便方法计算。
$19×\frac{7}{9}=(18 + 1)×\frac{7}{9}$ $ \frac{9}{13}×12=\frac{9}{13}×(13 - 1)$
= =
$19×\frac{7}{9}=(18 + 1)×\frac{7}{9}$ $ \frac{9}{13}×12=\frac{9}{13}×(13 - 1)$
= =
答案
$18×\frac 79+1×\frac 79$
$\frac 9{13}×13-\frac 9{13}$
$=14\frac 79$
$=8\frac 4{13}$
$\frac 9{13}×13-\frac 9{13}$
$=14\frac 79$
$=8\frac 4{13}$
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