一、口算。
$28×\frac{7}{8}=$
$48×\frac{13}{16}=$
$39×\frac{4}{13}=$
$\frac{2}{3}×4=$
$0.375×32=$
$42×\frac{5}{6}=$
$\frac{2}{3}×12=$
$\frac{3}{20}×30=$
$\frac{3}{4}×3=$
$51×\frac{6}{17}=$
$\frac{1}{7}×35=$
$\frac{4}{7}×56=$
$72×\frac{5}{12}=$
$\frac{2}{11}×55=$
$\frac{1}{7}×70=$
$85×\frac{3}{17}=$
$23×\frac{19}{23}=$
$\frac{1}{4}×5=$
$\frac{8}{9}×27=$
$\frac{3}{25}×5=$
$\frac{3}{50}×4=$
$28×\frac{7}{8}=$
$\frac{49}{2}$
$48×\frac{13}{16}=$
39
$39×\frac{4}{13}=$
12
$\frac{2}{3}×4=$
$\frac{8}{3}$
$0.375×32=$
12
$42×\frac{5}{6}=$
35
$\frac{2}{3}×12=$
8
$\frac{3}{20}×30=$
$\frac{9}{2}$
$\frac{3}{4}×3=$
$\frac{9}{4}$
$51×\frac{6}{17}=$
18
$\frac{1}{7}×35=$
5
$\frac{4}{7}×56=$
32
$72×\frac{5}{12}=$
30
$\frac{2}{11}×55=$
10
$\frac{1}{7}×70=$
10
$85×\frac{3}{17}=$
15
$23×\frac{19}{23}=$
19
$\frac{1}{4}×5=$
$\frac{5}{4}$
$\frac{8}{9}×27=$
24
$\frac{3}{25}×5=$
$\frac{3}{5}$
$\frac{3}{50}×4=$
$\frac{6}{25}$
答案
一、$\frac{49}{2}$ 39 12
$\frac{8}{3}$ 12 35
8 $\frac{9}{2}$ $\frac{9}{4}$
18 5 32
30 10 10
15 19 $\frac{5}{4}$
24 $\frac{3}{5}$ $\frac{6}{25}$
$\frac{8}{3}$ 12 35
8 $\frac{9}{2}$ $\frac{9}{4}$
18 5 32
30 10 10
15 19 $\frac{5}{4}$
24 $\frac{3}{5}$ $\frac{6}{25}$
二、填一填。
1. $\frac{2}{5}+\frac{2}{5}+\frac{2}{5}+\frac{2}{5}+\frac{2}{5}=\frac{2}{5}×$(
2. $\frac{5}{9}×4=$(
3. $\underbrace{\frac{3}{5}+\frac{3}{5}+···+\frac{3}{5}}_{100\mathrm{ 个 }\frac{3}{5}}=$(
4. $\frac{1}{5}$的 $3$ 倍是(
1. $\frac{2}{5}+\frac{2}{5}+\frac{2}{5}+\frac{2}{5}+\frac{2}{5}=\frac{2}{5}×$(
5
)=(2
)2. $\frac{5}{9}×4=$(
$\frac{5}{9}$
)+($\frac{5}{9}$
)+($\frac{5}{9}$
)+($\frac{5}{9}$
)3. $\underbrace{\frac{3}{5}+\frac{3}{5}+···+\frac{3}{5}}_{100\mathrm{ 个 }\frac{3}{5}}=$(
$\frac{3}{5}$
)×(100
)=(60
)4. $\frac{1}{5}$的 $3$ 倍是(
$\frac{3}{5}$
),$6$ 个 $\frac{1}{3}$ 是(2
)。答案
二、1. 5 2
2. $\frac{5}{9}$ $\frac{5}{9}$ $\frac{5}{9}$ $\frac{5}{9}$
3. $\frac{3}{5}$ 100 60
4. $\frac{3}{5}$ 2
2. $\frac{5}{9}$ $\frac{5}{9}$ $\frac{5}{9}$ $\frac{5}{9}$
3. $\frac{3}{5}$ 100 60
4. $\frac{3}{5}$ 2
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