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1.算一算。
$4×\frac{7}{8}=$
$28×\frac{12}{35}=$
$9×\frac{7}{18}=$
$100×\frac{4}{25}=$
$18×\frac{3}{4}=$
$15×\frac{3}{10}=$
$81×\frac{7}{9}=$
$32×\frac{5}{64}=$
$4×\frac{7}{8}=$
$28×\frac{12}{35}=$
$9×\frac{7}{18}=$
$100×\frac{4}{25}=$
$18×\frac{3}{4}=$
$15×\frac{3}{10}=$
$81×\frac{7}{9}=$
$32×\frac{5}{64}=$
答案
$4×\frac{7}{8} = \frac{\overset{1}{\cancel{4}}×7}{\underset{2}{\cancel{8}}} = \frac{7}{2}$
$28×\frac{12}{35} = \frac{\overset{4}{\cancel{28}}×12}{\underset{5}{\cancel{35}}} = \frac{48}{5}$
$9×\frac{7}{18} = \frac{\overset{1}{\cancel{9}}×7}{\underset{2}{\cancel{18}}} = \frac{7}{2}$
$100×\frac{4}{25} = \frac{\overset{4}{\cancel{100}}×4}{\underset{1}{\cancel{25}}} = 16$
$18×\frac{3}{4} = \frac{\overset{9}{\cancel{18}}×3}{\underset{2}{\cancel{4}}} = \frac{27}{2}$
$15×\frac{3}{10} = \frac{\overset{3}{\cancel{15}}×3}{\underset{2}{\cancel{10}}} = \frac{9}{2}$
$81×\frac{7}{9} = \frac{\overset{9}{\cancel{81}}×7}{\underset{1}{\cancel{9}}} = 63$
$32×\frac{5}{64} = \frac{\overset{1}{\cancel{32}}×5}{\underset{2}{\cancel{64}}} = \frac{5}{2}$
$28×\frac{12}{35} = \frac{\overset{4}{\cancel{28}}×12}{\underset{5}{\cancel{35}}} = \frac{48}{5}$
$9×\frac{7}{18} = \frac{\overset{1}{\cancel{9}}×7}{\underset{2}{\cancel{18}}} = \frac{7}{2}$
$100×\frac{4}{25} = \frac{\overset{4}{\cancel{100}}×4}{\underset{1}{\cancel{25}}} = 16$
$18×\frac{3}{4} = \frac{\overset{9}{\cancel{18}}×3}{\underset{2}{\cancel{4}}} = \frac{27}{2}$
$15×\frac{3}{10} = \frac{\overset{3}{\cancel{15}}×3}{\underset{2}{\cancel{10}}} = \frac{9}{2}$
$81×\frac{7}{9} = \frac{\overset{9}{\cancel{81}}×7}{\underset{1}{\cancel{9}}} = 63$
$32×\frac{5}{64} = \frac{\overset{1}{\cancel{32}}×5}{\underset{2}{\cancel{64}}} = \frac{5}{2}$
2. 单位换算。
$\frac{2}{5}$米=()分米 $\frac{2}{3}$时=()分 $\frac{7}{10}$公顷=()$\mathrm{m}^2$
$\frac{3}{4}$年=()月 $\frac{3}{5}\ \mathrm{dm}^2$=()$\mathrm{cm}^2$ $\frac{5}{8}$升=()毫升
$\frac{2}{5}$米=()分米 $\frac{2}{3}$时=()分 $\frac{7}{10}$公顷=()$\mathrm{m}^2$
$\frac{3}{4}$年=()月 $\frac{3}{5}\ \mathrm{dm}^2$=()$\mathrm{cm}^2$ $\frac{5}{8}$升=()毫升
答案
$\frac{2}{5}×10=4$
$\frac{2}{3}×60=40$
$\frac{7}{10}×10000=7000$
$\frac{3}{4}×12=9$
$\frac{3}{5}×100=60$
$\frac{5}{8}×1000=625$
$\frac{2}{5}$米=(4)分米
$\frac{2}{3}$时=(40)分
$\frac{7}{10}$公顷=(7000)$\mathrm{m}^2$
$\frac{3}{4}$年=(9)月
$\frac{3}{5}\ \mathrm{dm}^2$=(60)$\mathrm{cm}^2$
$\frac{5}{8}$升=(625)毫升
$\frac{2}{3}×60=40$
$\frac{7}{10}×10000=7000$
$\frac{3}{4}×12=9$
$\frac{3}{5}×100=60$
$\frac{5}{8}×1000=625$
$\frac{2}{5}$米=(4)分米
$\frac{2}{3}$时=(40)分
$\frac{7}{10}$公顷=(7000)$\mathrm{m}^2$
$\frac{3}{4}$年=(9)月
$\frac{3}{5}\ \mathrm{dm}^2$=(60)$\mathrm{cm}^2$
$\frac{5}{8}$升=(625)毫升
3.据了解:坚持每天行走6000步以上,可有效促进人体健康。3月7日,爸爸行走了12500步,妈妈的步数是爸爸的$\frac{3}{5}$,妈妈这天的步数达到6000步了吗?要解决这个问题,图中三种解题思路中,(
A.①②
B.①③
C.②③
D.①②③
D
)正确。A.①②
B.①③
C.②③
D.①②③
答案
3.D
4.一个漏水的水龙头每小时滴水$\frac{4}{9}$升。如果不及时修理，照这样的速度，一天要浪费多少升水？
答案
4.$\frac{4}{9}×24=\frac{32}{3}$(升)
5.小明从一楼走到二楼需要$\frac{3}{4}$分钟，他家住在图中所示的五楼，用同样的速度，他从一楼回到家需要多少分钟？
答案
5.$\frac{3}{4}×4=3$(分)
