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Edexcel IGCSE Maths 复习笔记 2.10.1 Equations & Problem Solving

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Edexcel IGCSE Maths 复习笔记 2.10.1 Equations & Problem Solving

What is problem solving?

Problem solving in mathematics involves using several stages, across a variety of topics, to answer a question
In this set of notes all the problems will involve?equations
- These could be?linear?equations,?quadratic?equations or?simultaneous?equations and?other, relatively straightforward equations

You may notice there are not many subheadings in these notes
That is deliberate so the examples are not labelled or dealt with in an order
- This is the nature of problem solving questions!
- You never know exactly what’s coming ... !

In an ordinary mathematics question you would be given an equation to solve
In a problem solving question you would have to?generate?the equation ...
- ... using information from the question
- ... using your knowledge of standard mathematical results

A key feature of problem solving questions is to?interpret?the answer in?context
An answer on a calculator may be?2
- If the question was about money then your final answer should be?￡1.20
A?quadratic?equation can have?two?solutions
- Only?one?may be valid if?only?positive values are relevant (eg distance)

In problem solving questions you are typically given less information about the type of maths involved
It is impossible to list every type of problem solving question you could see
- There are endless contexts questions can be set in
- There is no one-fits-all step-by-step method to solving problems
Practice,?experience?and?familiarity?are the keys to solving problems successfully

Do?not?necessarily expect whole number (integer) or “nice” solutions
- Especially where a calculator is allowed
Rounding?appropriately?may be one of the skills being tested
- eg Rounding a value in?cm?only needs to be to one decimal place;so it indicates?mm

Exam Tip

Do?not?start by focusing on what the question has asked you to find, but?on what maths you?can?do.If your attempt turns out to be unhelpful, that’s fine, you may still pick up some marks.If your attempt is relevant it could nudge you towards the full solution – and full marks!Add information to a?diagram?as you work through a problem. If there is no diagram, try?sketching?one.