Edexcel IGCSE Maths复习笔记 1.7.2 Percentage Increases & Decreases How do I increase or decrease by a percentage? Identify “before” & “after” quantities Find percentage of “before” that we ...
Edexcel IGCSE Maths复习笔记 1.7.1 Basic Percentages What is a percentage? “Per-cent” simply means “ ÷ 100” (or “out of 100”) You can think of a percentage as a standardised way of expressing a frac...
Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams What do I need to know? You’ll be drawing Venn diagrams so make sure you are familiar with those first Notation ξ is the universal...
Edexcel IGCSE Maths复习笔记 1.5.2 Surds - Rationalising Denominators What is a surd? A surd is the square root of a non-square integer How do we rationalise the denominator of a surd? Worked Exampl...
Edexcel IGCSE Maths复习笔记 1.5.1 Surds - Basics What is a surd? A surd is the square root of a non-square integer What can we do with surds? 1. Multiplying surds – you can multiply numbers under s...
Edexcel IGCSE Maths复习笔记 1.4.2 Roots & Indices - Harder What are indices? An Index (plural = indices) is just a power that a number (called the base) is raised to: Laws of indices – what you...
What are indices? An Index (plural = indices) is just a power that a number (called the base) is raised to: Laws of indices – what you need to know There are lots of very important laws (or ...
Edexcel IGCSE Maths复习笔记 1.3.2 HCFs & LCMs What are Factors & Multiples? Factors are numbers (or expressions) which divide into another number exactly e.g. 3 is a factor of 18 as
Edexcel IGCSE Maths复习笔记 1.3.1 Prime Factors What are prime factors? Factors are things that are multiplied together Prime numbers are numbers which can only be divided by themselves and 1 The p...
