请用小学生可以听懂的方式讲解这套试卷，要生动形象，最好配有插图---**Header:** 人教版四年级数学上册第一单元测试卷 大数的认识 **Student Information:** 班级: _______ 姓名: _______ 学号: _______ 得分: _______ --- **一、填空题 (每空1分, 共20分)** 1. 从个位起，第 ______ 位是万位，第 ______ 位是亿位。 2. 10个一万是 ______，10个 ______ 是一亿。 3. 一个数由5个千万、3个十万和2个百组成，这个数写作 ______，读作 ______。 4. 在数字6和8之间添上 ______ 个0，这个数就变成六千万零八。 5. 最大的七位数是 ______，最小的八位数是 ______，它们相差 ______。 6. 把下面各数改写成用"万"或"亿"作单位的数: 360000 = ______ 万 250000000 = ______ 亿 7. 省略万位后面的尾数: 349800 ≈ ______ 万 5999900 ≈ ______ 万 8. 在○里填上">"、"<"或"=": 1000000 ○ 999999 三百万 ○ 3000000 4500000 ○ 450万 --- **二、选择题 (每题2分, 共20分)** 1. 下面各数中，一个零也不读的是 ( )。 A. 3006000 B. 30060000 C. 30600000 D. 30000600 2. 一百万一百万地数，数10次是 ( )。 A. 十万 B. 一千万 C. 一亿 D. 十亿 3. 下面各数中，最接近50万的数是 ( )。 A. 499999 B. 500010 C. 500100 D. 501000 4. 一个数的最高位是千万位，这个数是 ( ) 位数。 A. 7 B. 8 C. 9 D. 10 5. 用2个5和3个0可以组成 ( ) 个不同的五位数。 A. 3 B. 4 C. 5 D. 6 **Section: Multiple Choice Questions** **Question 6** * **Question Stem:** 下面说法正确的是（）。 * **Options:** * A. 计数单位就是数位 * B. 万级的计数单位有万、十万、百万、千万 * C. 每两个计数单位之间的进率是10 * D. 一个数含有三级，这个数一定是十二位数 **Question 7** * **Question Stem:** 59□760≈60万，□里可以填（）。 * **Options:** * A. 0-4 * B. 5-9 * C. 1-9 * D. 0-9 **Question 8** * **Question Stem:** 下面各数中，最大的数是（）。 * **Options:** * A. 507039 * B. 507309 * C. 507903 * D. 507930 **Question 9** * **Question Stem:** 一个数省略万位后面的尾数是8万，这个数最大可能是（）。 * **Options:** * A. 79999 * B. 84999 * C. 85999 * D. 89999 **Question 10** * **Question Stem:** 用3个5和2个0组成一个五位数，两个0都读出来的是（）。 * **Options:** * A. 55050 * B. 50505 * C. 50055 * D. 50550 --- **Section: 三、判断题 (III. True/False Questions)** * **Section Header:** 三、判断题 (每题1分, 共10分) **Question 1** * **Question Stem:** 万位、十万位、百万位、千万位都是万级的计数单位。() **Question 2** * **Question Stem:** 比较两个数的大小，首先看最高位上的数。() **Question 3** * **Question Stem:** 自然数的个数是无限的，最小的自然数是0。() **Question 4** * **Question Stem:** 7006000读作七百万零六千。() **Question 5** * **Question Stem:** 近似数都比准确数小。() **Question 6** * **Question Stem:** 最大的五位数与最小的六位数相差1。() **Question 7** * **Question Stem:** 亿级的数表示多少个亿，万级的数表示多少个万。() **Question 8** * **Question Stem:** 一个数含有两级，这个数一定是八位数。() **Question 9** * **Question Stem:** 3003000读作三百零三千。() **Question 10** * **Question Stem:** 与"万"相邻的两个计数单位分别是"千"和"十万"。() --- **Section: 四、图形题 (IV. Chart/Diagram Questions)** * **Section Header:** 四、图形题 (每题5分, 共20分) **Question 1** * **Question Stem:** 在计数器上画出下面各数。 * **Chart/Diagram Description:** * **Type:** A representation of a counting frame or place value chart. * **Main Elements:** * A horizontal line forms the base of the counting frame, with several vertical lines dividing it into 8 columns, representing different place values. * Above each column, a digit is written. These digits, from left to right, are: 3, 0, 5, 2, 0, 0, 7, 0. * Together, these digits represent the number 30,520,070. * The task requires indicating this number on such a counting frame, typically by drawing beads or marking the value for each place. Here is the complete and accurate extraction of content from the image: --- **Problem (Unnumbered, Top of Page)** **Textual Information:** * **Place Value Table (Header):** * 千万 (Ten Million) * 百万 (Million) * 十万 (Hundred Thousand) * 万 (Ten Thousand) * 千 (Thousand) * 百 (Hundred) * 十 (Ten) * 个 (One) * **Question:** 这个数读作: ______ (This number is read as: ______) * **Note:** The actual number to be read is not provided in the image for this problem. --- **Problem 2** **Textual Information:** * **Question Stem:** 在下面的数轴上标出245000和308000的大致位置。(Mark the approximate positions of 245000 and 308000 on the number line below.) **Chart Description:** * **Type:** Number line. * **Main Elements:** * A horizontal straight line. * **Points/Labels:** * A marked point on the left labeled "20万" (200,000). * A marked point further to the right, encircled, labeled "25万" (250,000). * There are five smaller, equally spaced tick marks between 20万 and 25万. * The number line extends beyond 25万 to the right. * **Scale:** The interval between 20万 and 25万 is divided into 5 segments, implying each segment represents 1万 (10,000). Therefore, the ticks represent 20万, 21万, 22万, 23万, 24万, 25万. * **Units:** 万 (Ten Thousand). * **Required Action (Implicit):** The user is expected to mentally or physically mark 245000 (which is 24.5万, halfway between 24万 and 25万) and 308000 (which is 30.8万, significantly to the right of 25万). --- **Problem 3** **Textual Information:** * **Question Stem:** 根据算盘写出数字。(Write the number according to the abacus.) * **Other Relevant Text:** 这个数写作: ______ (This number is written as: ______) **Chart Description:** * **Type:** Abacus-like counting frame (or simplified suanpan). * **Main Elements:** * Seven vertical rods, each representing a place value. * A horizontal bar separates the beads into an upper section (representing 5) and a lower section (representing 1). * **Place Value Labels (from left to right):** 百万 (Million), 十万 (Hundred Thousand), 万 (Ten Thousand), 千 (Thousand), 百 (Hundred), 十 (Ten), 个 (One). * **Beads (from left to right, interpreted as top bead = 5, bottom bead = 1):** * **百万 (Million):** 1 red bead (top), 1 blue bead (bottom). Value: 5 + 1 = 6. * **十万 (Hundred Thousand):** 1 red bead (top), 1 blue bead (bottom). Value: 5 + 1 = 6. * **万 (Ten Thousand):** 1 red bead (top), 0 blue beads (bottom). Value: 5 + 0 = 5. * **千 (Thousand):** 0 red beads (top), 1 blue bead (bottom). Value: 0 + 1 = 1. * **百 (Hundred):** 0 red beads (top), 1 blue bead (bottom). Value: 0 + 1 = 1. * **十 (Ten):** 0 red beads (top), 1 blue bead (bottom). Value: 0 + 1 = 1. * **个 (One):** 0 red beads (top), 1 blue bead (bottom). Value: 0 + 1 = 1. * **Inferred Number:** 6,651,111 (Six million, six hundred fifty-one thousand, one hundred eleven). --- **Problem 4** **Textual Information:** * **Question Stem:** 根据下面的数位顺序表填空。(Fill in the blanks according to the place value chart below.) * **Table Content:** * **Row 1 (Classes):** * 亿级 (Billions Class) * 万级 (Ten Thousands Class) * 个级 (Ones Class) * **Row 2 (Place Values, partially filled):** * Under 亿级: 亿位 (Hundred Million Place / 10^8) * Under 万级: 万位 (Ten Thousand Place / 10^4) * Under 个级: 千位 (Thousand Place / 10^3), 个位 (Ones Place / 10^0) * **Row 3 (Missing Place Values):** Indicated by "......" or empty cells. * Implicitly, the table is structured to represent the standard Chinese place value system. * Complete 亿级 (Billions Class) would include: 千亿位 (Hundred Billion), 百亿位 (Ten Billion), 十亿位 (Billion), 亿位 (Hundred Million). * Complete 万级 (Ten Thousands Class) would include: 千万位 (Ten Million), 百万位 (Million), 十万位 (Hundred Thousand), 万位 (Ten Thousand). * Complete 个级 (Ones Class) would include: 千位 (Thousand), 百位 (Hundred), 十位 (Ten), 个位 (One). * **Fill-in-the-blank Sentence:** * 从右边起，第 ______ 位是万位，第 ______ 位是亿位。 * (Starting from the right, the **fifth** place is the ten thousand place, the **ninth** place is the hundred million place.) --- **Section Header** * **Title:** 五、应用题 (Section Five, Application Problems) * **Subtitle:** (每题6分, 共30分) (6 points per question, total 30 points) --- **Problem 1 (under Section Five)** **Textual Information:** * **Question Stem:** 一个数由3个百万、5个万、6个千和4个十组成，这个数是多少？读作什么？ (A number is composed of 3 millions, 5 ten thousands, 6 thousands, and 4 tens. What is this number? How is it read?) * **Components of the number:** * 3个百万 (3 millions) = 3,000,000 * 5个万 (5 ten thousands) = 50,000 * 6个千 (6 thousands) = 6,000 * 4个十 (4 tens) = 40 * **Calculated Number:** 3,000,000 + 50,000 + 6,000 + 40 = 3,056,040 * **Reading of the number:** 三百零五万六千零四十 (Three million fifty-six thousand forty) --- Here is the complete and accurate extraction of the content from the image: --- **Question 2** 用0、0、0、1、2、3、4这七个数字按要求组成七位数。(每种写一个即可) (1) 读两个0: (2) 读一个0: (3) 所有的0都不读: (4) 读三个0: **Question 3** 一个自然数四舍五入到万位后是10万, 这个数最大是多少? 最小是多少? **Question 4** 小明的爸爸有一个七位数的电话号码, 最高位是8, 万位是2, 百位是5, 其余各位都是( **Question 5** 一个九位数, 各个位数上的数字之和是15, 其中万位上的数字是亿位上的2倍, 这个数最大是多少? 最小是多少? --- **参考答案 (Reference Answers)** **一、填空题 (Fill-in-the-blanks)** 1. 五, 九 2. 十万, 一千万 3. 50300200, 五千零三十万零二百 4. 6 5. 99999999, 10000000, 1 6. 36 25 The following content is extracted from the image: **Unlabeled Section (Likely answers from a preceding section):** 5. 35, 25 7. 35, 600 8. >, =, = **二、选择题 (Multiple Choice Questions)** 1. A 2. B 3. A 4. B 5. B 6. B 7. B 8. D 9. B 10. B **三、判断题 (True/False Questions)** 1. × 2. ✓ 3. ✓ 4. × 5. × 6. ✓ 7. ✓ 8. × 9. ✓ 10. ✓ **四、图形题 (Geometry/Diagram Questions)** 1. 三千零五万二千零七十 2. 图略 (245000在24万和25万之间偏左, 308000在30万和31万之间偏左) 3. 3050200 4. 五, 九 **五、应用题 (Application Questions)** 1. 3056040, 三百零五万六千零四十 2. (答案不唯一) (1) 1020340 (2) 1023400 (3) 1234000 (4) 1020304 3. 最大是104999, 最小是95000 **Chart/Diagram Description:** No charts or diagrams are present in the image. Item 2 under "四、图形题" explicitly states "图略" (diagram omitted). Here is the extracted content from the image: **Question 4:** 8020500 **Question 5:** 最大是430080000, 最小是100000239 (Translation: The maximum is 430080000, the minimum is 100000239)