11．直接写得数
0 154907 154915 154921 154925 154931 154933 154937 154943 154945 154951 154957 154961 154963 154967 154973 154975 154981 154985 154987 154991 154993 154997 154999 155001 155002 155003 155005 155006 155007 155009 155011 155015 155017 155021 155023 155027 155033 155035 155041 155045 155047 155051 155057 155063 155065 155071 155075 155077 155083 155087 155093 155101 199269
| 37+63= | 160÷4= | 250×4= | 1300×3= | 640÷8= | 1-$\frac{2}{5}$= |
| $\frac{7}{8}$+$\frac{1}{8}$= | $\frac{7}{9}$-$\frac{2}{9}$= | 27÷9= | 51÷5= | 298×5≈ | 402×5≈ |