📚 Year 8 AQA Maths: Formula & Theorem Quick Reference | Year 8 AQA 数学：公式定理速查手册
This quick reference guide brings together the essential formulas and theorems covered in Year 8 AQA Mathematics. Use it to check key facts, support your homework, and prepare for assessments.
本速查手册汇集了 Year 8 AQA 数学课程中的核心公式与定理。你可以用它核对关键知识点、辅助家庭作业和备考。
1. Order of Operations (BIDMAS) | 运算顺序 (BIDMAS)
BIDMAS (or BODMAS) tells us the order in which operations must be performed: Brackets first, then Indices (powers, roots), followed by Division and Multiplication (from left to right), and finally Addition and Subtraction (from left to right).
BIDMAS（或 BODMAS）规定了运算的执行顺序：首先是括号 (Brackets)，然后是指数 (Indices，即幂和根)，接着是除法与乘法 (从左到右)，最后是加法与减法 (从左到右)。
For example, in the expression 3 + 4 × 2, multiply first: 4 × 2 = 8, then add 3 to get 11.
例如，在表达式 3 + 4 × 2 中，先计算乘法：4 × 2 = 8，然后加上 3 得到 11。
s in (3 + 4) × 2, work inside the brackets first: 3 + 4 = 7, then multiply by 2 to get 14.
当有括号时，如 (3 + 4) × 2，先算括号内的：3 + 4 = 7，再乘以 2 得到 14。
2. Fractions, Decimals & Percentages | 分数、小数与百分数
n to a decimal, divide the numerator by the denominator. For example, 3/8 = 3 ÷ 8 = 0.375.
分数化小数：用分子除以分母。例如 3/8 = 3 ÷ 8 = 0.375。
To convert a decimal to a percentage, multiply by 100 and add the % sign. For example, 0
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