Year 7 Cambridge Advanced Mathematics: Quick Reference Handbook of Formulas and Theorems | Year 7 Cambridge 进阶数学：公式定理速查手册

📚 Year 7 Cambridge Advanced Mathematics: Quick Reference Handbook of Formulas and Theorems | Year 7 Cambridge 进阶数学：公式定理速查手册

This handbook is designed for Year 7 students following the Cambridge Advanced Mathematics curriculum. It summarises essential formulas, properties, and theorems you need to recall quickly for homework, tests, and exams. Keep it handy and use it to reinforce your understanding of key topics.

本手册专为学习 Cambridge 进阶数学课程的 Year 7 学生编写，总结了作业、测验和考试中需要快速回忆的重要公式、性质和定理。请随时查阅，以巩固你对关键主题的理解。

1. Number Operations and Properties | 数的运算与性质

The place value system with decimals: Each digit in a number has a value depending on its position. For example, in 5 724.639, the digit 7 is worth 7 hundreds (700), and the digit 3 is worth 3 hundredths (0.03).

带小数的位值系统：一个数中每一位数字根据其位置有不同的值。例如在 5 724.639 中，数字 7 代表 7 个百 (700)，数字 3 代表 3 个百分之一 (0.03)。

Commutative law: a + b = b + a and a × b = b × a

交换律：a + b = b + a 且 a × b

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