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Page 1

\(4.23\times 3 = 69\) (根)

\(5.22\times 4 = 88\) (元)

\(6.(1)21\times 2 = 42\) (盆)

\((2)42\times 2 = 84\) (盆)

\(7.4 - 1 = 3\) (层) \(21\times 3 = 63\) (级)

第8课时 两、三位数乘一位数(不连续进位)

1.72 255 386 2448 个 十 前一 几

2.72 81 1464 489 654 688(竖式计算略)

\(3.28\times 3 = 84\) (人)

\(4.41\times 7 = 287\) (个)

\(5.411\times 8 = 3288\)

\(6.5\times (132 - 1) = 655\) (米)

第9课时 练习二(1)

1.27 61 23 24 54 66 22 34

2.166 76 872 3284

\(3. \times \frac{1}{2}\times \frac{2}{8}\times \frac{6}{84}\times \frac{1}{3}\)

4.96 188 566 585 1248 1248(竖式计算略)

5.96 72 78

\(6.182\times 3 = 546\) (米)

7. 不行

第10课时 练习二(2)

1.60 63 69;80 82 86

2.62 88 86 66 96;48 88 69 68

\(39;93\) 88 84 48 99

3. 想略 126 72 1293 429

4.76 288 651 3648 917 1866(竖式计算略)

\(5.16\times 6 = 96\) (棵) \(96 + 50 = 146\) (棵)

\(6.15 + 9 = 24\) (个) \(24\times 3 = 72\) (个)

7. (答案不唯一)

第11课时 两、三位数乘

一位数(连续进位)

1.424 282 2555 744

\(7.8\) 561 632 \(2.\frac{x}{2} +\frac{3}{4} \times \frac{5}{2} +\frac{1}{8} \times \frac{2}{5} +\frac{1}{8} \times \frac{1}{8}\)

3.228 296 5535 3661(竖式计算略)

\(4.186\times 3 = 558\) (本)

\(5.98\times 4 = 392\) (张) 428- 392=36(张)

张叔叔的邮票多,多36张

\(6.(1)83\times 5 = 415\) (箱)

\((2)415 + 36 = 451\) (箱)

\(7.66\times 7 = 462\) (米) \(462 + 6 = 468\) (米)

第12课时 练习三(1)

1.51 30 71 50 33 31

2.371 416 370 1518 612 885 2896 2730(竖式计算略)

3.640 1140 2690;172 1692 1972

4. 小红: \(98\times 6 = 588\) (个)

小美: \(116\times 5 = 580\) (个)

\(5.18\times 3 + 8 = 62\) (元)

\(6.24\times 4 - 38 = 58\) (瓶)

第13课时 练习三(2)

1.36 51;26 78

2. (从下到上)87 136 72 96 52;81

70 60 84 96

3.112 5517 1335 651 2790 6656(竖式计算略)

\(4.29\times 4 = 116\) (页) \(116 > 106\) 116- 106 \(= 10\) (页)

凡凡看得多,多10页。

5. \((1)16\times 5 - 24 = 56\) (块)

\((2)28 + 42 - 24 = 46\) (块)

6. \((1)145\times 8 = 1160\) (元) \(1160< 1200\)

够。或把145看作 \(150,150\times 8 = 1200\) (元)