📚 Answers pp01-52 Grade 9 Core Answers | 9年级核心答案（第1-52页）
This revision guide covers the key answers and methods found on pages 1 to 52 of the Grade 9 Core Mathematics workbook. It is designed for students preparing for checkpoint or internal school examinations. Each section pairs a concise English explanation with a Chinese translation so that learners can check their understanding and avoid common errors.
本复习指南涵盖9年级核心数学练习册第1至52页的关键答案与方法，适用于备考 checkpoint 或校内考试的学生。每个小节都配有简洁的英文说明和中文译文，帮助学习者检查理解情况并避免常见错误。
1. Number and Place Value | 数与位值
Pages 1-8 focus on place value, ordering integers and rounding. The digit 7 in 4 752 has a value of 700 because it is in the hundreds column. To write a number in expanded form, break it into thousands, hundreds, tens and units.
第1-8页重点考查位值、整数排序与四舍五入。数字 7 在 4 752 中的值为 700，因为它位于百位。要把一个数写成展开式，需将其拆分为千位、百位、十位和个位。
A common answer is to round 38 476 to the nearest thousand, which gives 38 000, because the hundreds digit is 4. Rounding to the nearest hundred gives 38 500 because the tens digit is 7.
一个常见答案是将 38 476 四舍五入到千位，得到 38 000，因为百位数字是 4。四舍五入到百位则得到 38 500，因为十位数字是 7。
38 476 ≈ 38 000 (to the nearest thousand)
When ordering integers from largest to smallest, remember that negative numbers are smaller than positive numbers. For example, -4, -1, 0, 3, 8 is correct ascending order.
在将整数从大到小排序时，请记住负数小于正数。例如，-4、-1、0、3、8 是正确的升序排列。
2. Fractions, Decimals and Percentages | 分数、小数与百分数Published by TutorHao | Exam Prep Revision Series | aleveler.com
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