山东四年级下册数学单元综合测试卷

（内容：四则运算、运算律、小数的意义和性质）

完成时间：_______ 分钟 得分：_______

一、填空题（每空1分，共20分）

1. 根据 $368 + 192 = 560$，直接写出下面两道算式的得数：$560 - 368 =$ ________，$560 - 192 =$ ________。

2. 计算 $240 \div (12 \times 5)$ 时，应先算 ________ 法，再算 ________ 法，结果是 ________。

3. 乘法分配律用字母表示为 $(a + b) \times c =$ ________。运用乘法分配律计算 $25 \times 44$ 时，可以写成 $25 \times (40 + 4)$ 或 $25 \times ( \_\_\_\_ \times 11)$。

4. $0.8$ 的计数单位是 ________，它有 ________ 个这样的计数单位。$0.80$ 的计数单位是 ________，它有 ________ 个这样的计数单位。

5. 把 $3.05$ 扩大到原数的 $100$ 倍是 ________；把 $42.7$ 缩小到原数的 $\frac{1}{1000}$ 是 ________。

6. 在 ○ 里填上“>”、“<”或“=”。

$5.72$ ○ $5.27$      $0.809$ ○ $0.81$      $3.50$ ○ $3.5$      $6.8$ 吨 ○ $680$ 千克

7. 一个数由 $5$ 个十、$3$ 个十分之一和 $7$ 个千分之一组成，这个数写作 ________，读作 ________。

8. 按照“四舍五入”法，近似数为 $6.30$ 的三位小数最大是 ________，最小是 ________。

二、判断题（对的打“√”，错的打“×”，每题1分，共5分）

（  ）1. $0$ 除以任何数都得 $0$。

（  ）2. $25 \times 4 \div 25 \times 4 = 1$。

（ ）3. 应用运算律可以使一些计算简便。

（  ）4. 小数点后面添上“$0$”或去掉“$0$”，小数的大小不变。

（  ）5. $5.05$ 和 $5.049$ 保留一位小数都是 $5.1$。

三、选择题（将正确答案的序号填在括号里，每题2分，共10分）

1. 已知 $○ + △ = □$，下面算式正确的是（    ）。

A. $○ + □ = △$    B. $△ + □ = ○$    C. $□ - △ = ○$

2. 下面算式与 $99 \times 78$ 计算结果相等的是（    ）。

A. $100 \times 78 - 1$    B. $100 \times 78 - 78$    C. $100 \times 78 + 78$

3. 下面各数中，要读出两个“零”的数是（    ）。

A. $103.005$    B. $300.06$    C. $305.07$

4. 把 $6.35$ 改写成 $6350$，原数就（    ）。

A. 扩大到原数的 $100$ 倍    B. 扩大到原数的 $1000$ 倍    C. 缩小到原数的 $\frac{1}{1000}$

5. 一个两位小数精确到十分位是 $8.0$，这个两位小数最大是（    ）。

A. $8.04$    B. $8.05$    C. $7.99$

四、计算题（共35分）

1. 直接写出得数。（每题1分，共8分）

2. 计算下面各题，能简算的要简算。（每题3分，共18分）

（1）$168 - 52 - 48$                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   &