📚 Year 8 Cambridge Maths: Key Vocabulary & Terms Memorisation Guide | 八年级剑桥数学关键词汇术语速记指南
In Year 8 Cambridge Mathematics, mastering key vocabulary is essential for understanding concepts, solving problems, and excelling in the Checkpoint exam. This guide provides clear definitions, memory aids, and bilingual explanations to help you memorise important terms quickly and effectively.
在八年级剑桥数学中，掌握关键词汇对于理解概念、解决问题以及在Checkpoint考试中取得优异成绩至关重要。本指南提供清晰的定义、记忆辅助以及中英双语解释，帮助你快速有效地记住重要术语。
1. Number Types and Place Value | 数的类型与位值
Integer: An integer is any whole number that can be positive, negative, or zero. It does not include fractions or decimals. Examples: −5, 0, 12.
整数：整数是任何正数、负数或零的整数，不包括分数或小数。例如：−5, 0, 12。
Positive and Negative Numbers: Positive numbers are greater than zero; negative numbers are less than zero. They are often shown on a number line. The absolute value of a number is its distance from zero, always positive. E.g., |−7| = 7.
正数与负数：正数大于零；负数小于零。它们通常显示在数轴上。一个数的绝对值是该数到零的距离，总是正数。例如 |−7| = 7。
Place Value and Digits: Every digit in a number has a place value based on its position (units, tens, hundreds, tenths, hundredths, etc.). For example, in 345.6, the digit 4 represents 40 (4 tens). Understanding place value is crucial for comparing numbers and rounding.
位值与数字：数字中的每一位数字根据其位置（个位、十位、百位、十分位、百分位等）都有位值。例如，在345.6中，数字4表示40（4个十）。理解位值对于比较数字和四舍五入至关重要。
Rounding, Decimal Places, and Significant Figures: Rounding approximates a number to a required accuracy. Decimal places (d.p.) count digits after the decimal point; significant figures (s.f.) count from the first non‑zero digit. E.g., 3.1416 rounded to 2 d.p. is 3.14; to 3 s.f. is 3.14.
四舍五入、小数位数与有效数字：四舍五入是将数字近似到所需精度。小数位数计算小数点后的数字位；有效
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