Edexcel IGCSE Maths 復習筆記 1.11.1 Ratios
Edexcel IGCSE Maths 復習筆記 1.11.1 Ratios What is a ratio? A?ratio?is a way of comparing one part of a whole to another A?ratio?can also be expressed as a?fraction?(of the whole) We often use a ra...
Edexcel IGCSE Maths復習筆記 1.10.1 Rounding & Estimation
Edexcel IGCSE Maths復習筆記 1.10.1 Rounding & Estimation Why use estimation? We?estimate?to find approximations for difficult sums Or to check our answers are about the right size (right order ...
Edexcel IGCSE Maths復習筆記 1.9.1 Compound Interest
Edexcel IGCSE Maths復習筆記 1.9.1 Compound Interest What is compound interest? Compound interest is where interest is paid on the interest from the year (or whatever time frame is being used) befor...
Edexcel IGCSE Maths復習筆記 1.8.1 Reverse Percentages
What is a reverse percentage? A reverse percentage question is one where we are given?the value after a percentage increase or decrease?and asked to find the value before the change How to do rever...
Edexcel IGCSE Maths復習筆記 1.7.2 Percentage Increases & Decreases
Edexcel IGCSE Maths復習筆記 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 復習筆記 1.7.1 Basic Percentages
Edexcel IGCSE Maths復習筆記 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復習筆記 1.6.1 Set Notation & Venn Diagrams
Edexcel IGCSE Maths復習筆記 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復習筆記 1.5.2 Surds - Rationalising Denominators
Edexcel IGCSE Maths復習筆記 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復習筆記 1.5.1 Surds - Basics
Edexcel IGCSE Maths復習筆記 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...
