11．直接写得数．
| $\frac{1}{4}$×$\frac{2}{5}$= | $\frac{7}{12}$×$\frac{3}{14}$= | 0.9×$\frac{3}{4}$= | 9×$\frac{7}{18}$= | $\frac{2}{3}$×$\frac{9}{10}$= |
| $\frac{5}{8}$×$\frac{2}{5}$= | $\frac{4}{21}$×$\frac{7}{8}$= | 39×$\frac{1}{13}$= | $\frac{8}{15}$×$\frac{9}{10}$= | 80×$\frac{3}{4}$×$\frac{1}{3}$= |
4．直接写得数．
0 164865 164873 164879 164883 164889 164891 164895 164901 164903 164909 164915 164919 164921 164925 164931 164933 164939 164943 164945 164949 164951 164955 164957 164959 164960 164961 164963 164964 164965 164967 164969 164973 164975 164979 164981 164985 164991 164993 164999 165003 165005 165009 165015 165021 165023 165029 165033 165035 165041 165045 165051 165059 199269
| $\frac{1}{3}$×0= | $\frac{1}{4}$×$\frac{2}{5}$= | $\frac{4}{25}$×100= | $\frac{4}{11}$×$\frac{11}{4}$= |
| 9×$\frac{7}{18}$= | $\frac{7}{12}$×$\frac{3}{14}$= | $\frac{3}{4}$×8×$\frac{2}{7}$= | 3×$\frac{1}{5}$×$\frac{5}{7}$= |