4．计算．
| $\frac{5}{26}$×$\frac{13}{20}$ | $\frac{16}{21}$×$\frac{7}{24}$ | $\frac{11}{49}$×$\frac{7}{66}$ |
| $\frac{5}{6}$×15+$\frac{1}{2}$ | $\frac{3}{4}$-$\frac{3}{5}$×$\frac{2}{3}$ | $\frac{11}{16}$×24×$\frac{4}{33}$ |
| $\frac{7}{5}$÷$\frac{15}{28}$×$\frac{5}{21}$ | 3-0.64×$\frac{7}{8}$÷8 | （$\frac{2}{3}$-$\frac{1}{6}$）÷$\frac{3}{8}$． |
3．一个闹钟的分针长10cm，从中午12：00到12：30，分针的尖端走过（ ）cm 的路程．
| A． | 62.8 | B． | 31.4 | C． | 12.56 |
2．在一个数（0除外）的后面添上百分号，这个数就（ ）
| A． | 扩大到原来的100倍 | B． | 缩小到原来的$\frac{1}{100}$ | ||
| C． | 大小不变 |
16．直接写出下列各题的得数
0 136253 136261 136267 136271 136277 136279 136283 136289 136291 136297 136303 136307 136309 136313 136319 136321 136327 136331 136333 136337 136339 136343 136345 136347 136348 136349 136351 136352 136353 136355 136357 136361 136363 136367 136369 136373 136379 136381 136387 136391 136393 136397 136403 136409 136411 136417 136421 136423 136429 136433 136439 136447 199269
| $\frac{1}{8}$×$\frac{4}{5}$= | 5×$\frac{4}{5}$= | $\frac{13}{20}$×$\frac{5}{26}$= | $\frac{11}{49}$×$\frac{7}{66}$= |
| $\frac{3}{8}$×$\frac{8}{9}$= | $\frac{2}{3}$×$\frac{3}{7}$= | $\frac{1}{4}$+$\frac{2}{5}$= | $\frac{1}{3}$×$\frac{4}{5}$= |
| $\frac{8}{15}$×$\frac{1}{4}$= | $\frac{5}{7}$×$\frac{21}{22}$= | $\frac{1}{8}$×$\frac{4}{13}$= | $\frac{2}{9}$÷$\frac{1}{6}$= |
| $\frac{3}{4}$÷$\frac{3}{5}$= | $\frac{5}{9}$÷$\frac{5}{6}$= | $\frac{5}{6}$÷$\frac{20}{23}$= | $\frac{5}{6}$-$\frac{3}{4}$= |
| 9×$\frac{4}{63}$= | $\frac{7}{18}$÷$\frac{7}{13}$= | $\frac{11}{54}$÷$\frac{1}{6}$= | 125÷$\frac{1}{8}$= |