4．用竖式计算．
| 374+286= | 517-348= | 200-185= |
| 508×5= | 350×6= | 634×8= |
3．直接写出得数．
| 87+5= | 82-7= | 34+6= | 6×0= | 56÷8= | 64÷9= |
| 50×3= | 700×6= | 2000×7= | 5×6+4 | 21×9≈ | 398×5≈ |
| $\frac{5}{9}$+$\frac{2}{9}$= | $\frac{3}{5}$-$\frac{2}{5}$= | $\frac{2}{3}$-$\frac{1}{3}$= | $\frac{1}{4}$+$\frac{2}{4}$= | $\frac{1}{3}$+$\frac{2}{3}$= | 1-$\frac{1}{4}$= |
1．我是计算小能手．（能简算的要简算）
0 160438 160446 160452 160456 160462 160464 160468 160474 160476 160482 160488 160492 160494 160498 160504 160506 160512 160516 160518 160522 160524 160528 160530 160532 160533 160534 160536 160537 160538 160540 160542 160546 160548 160552 160554 160558 160564 160566 160572 160576 160578 160582 160588 160594 160596 160602 160606 160608 160614 160618 160624 160632 199269
| $\frac{3}{13}$×$\frac{3}{7}$×26 | 75-72×$\frac{5}{12}$ | $\frac{8}{7}$×7+$\frac{3}{8}$ | $\frac{18}{25}$×$\frac{9}{16}$+$\frac{7}{25}$×$\frac{9}{16}$-$\frac{9}{16}$ |
| 63×$\frac{7}{62}$ | （$\frac{6}{5}$+$\frac{4}{5}$）×30 | $\frac{5}{9}$×$\frac{3}{4}$+$\frac{5}{9}$×$\frac{1}{4}$ | （$\frac{2}{15}$+$\frac{3}{11}$）×15×11 |