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Graphs and diagrams

Lists of numbers (numerical data) or formulas can be illustrated by diagrams or graphs. You can choose the scale that you want the calculator to use and you can magnify an interesting area of a graph (referred to as ‘zooming in’) should you want to look more closely at some feature or get more accurate information about something in that area.


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8.2.6 Information

The calculator will give you information about any number that you have entered: for example, its square or cube, its square root or cube root. It will also give you information about a whole list of numbers: for example, the mean (average) or the highest value in the list.


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8.2.5 Memory

The calculator retains numbers, formulas and programs which you have stored in it, even when it is turned off. You can recall them when you need them and so save time by not having to enter the same information again.


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Stressing and ignoring

Click on the 'View document' link below to read William Boyd on 'Cabbages are not spheres'.

View document61.3
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Acknowledgements

Unit image

Alist  [Details correct as of 27th June 2008]

 

All other material contained within this unit originated at the Open University.


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1.3.1 Try some yourself

1 The new home owners from Example 4 above want to price grass seed, as well as the turf (transport only). The best buy seems to be loose seed, which says ‘1 kilo covers 80 m2’. They wonder what length the side of an 80 m2
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1.2 Squaring fractions and negative numbers

You have now seen how to find squares of whole numbers and decimals. What about fractions? The rule is as before: to square a fraction, just multiply it by itself.

For example:

In Example 1, you could have used Author(s): The Open University

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1.1.1 Try some yourself

1 Evaluate the following:

  • (a) 62

  • (b) 0.52

  • (c) 1.52

Answer<
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Learning outcomes

By the end of this unit you should be able to:

  • evaluate the squares, cubes and other powers of positive and negative numbers with or without your calculator;

  • estimate square roots and calculate them using your calculator;

  • describe the power notation for expressing numbers;

  • use your calculator to find powers of numbers;

  • multiply and divide powers of the same number;

  • understand and apply negative powers, t
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Acknowledgements

The content acknowledged below is Proprietary (see terms and conditions) and is used under licence.

All materials included in this unit are derived from content originated at the Open University.


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Acknowledgements

All materials included in this unit are derived from content originated at the Open University.


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Summary

In this unit you have been introduced to the difference between mathematical content and processes. You have worked on the do–talk–record (DTR) framework for learning mathematics.


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1.3.8 Choosing the right tool for the job

Before searching it is always a good idea to check what the source you have chosen covers to make sure it will unearth information that matches your search need (you will notice that all the resources we’ve covered in this guide have short descriptions to enable you to decide which to use). Some of the decision makers, depending on the context of your search might be:

  • Does it have full text?

  • Does it cover the right subject?


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1.3.7 Internet resources

There are many websites where you will find useful information on maths and statistics. With all information on the internet you need to make a judgement on its reliability.

Royal Statistical Society Information about the Society, its publications, section and groups. Also covers caree
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1.3.4 Databases

At a basic level, a database is a collection of information which can be searched. It is a way of storing, indexing, organising and retrieving information. You may have created one yourself to keep track of your references – or your friends' names and addresses. They are useful for finding articles on a topic, and can be used to search for many different types of information.

You may find some of the following databases useful for your topic. They contain different types of informatio
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1.2.1 Planning your search

Your approach to searching will depend to a great extent on what kind of person you are. In an ideal world, when searching for information for a specific purpose, we would all find what exactly we were looking for at the first attempt, especially if we are in a hurry. However, it’s always a good idea to have some kind of plan when you are searching for information, if only to help you plan your time and make sure you find the information you need. If I was starting to search for material on
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1.1.3 Searching for information on maths and statistics

How well does the following statement match what you do when you begin a new search for information?

Before I begin a new search for information (maybe for an assignment, or to help you choose your next holiday destination), I spend some time thinking about what I already know, what the gaps in my knowledge are, and the best types of information to meet my needs.

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1.1.2 Key resources

When you need to find information in Arts or History, how confident are you that you know the best places to search (e.g. search engines, subject gateways, online databases etc.) to find the information you need?

  • 5 – Very confident

  • 4 – Confident

  • 3 – Fairly confident

  • 2 – Not very confident

  • 1 – Not confident at all

How familiar are you with journal articl
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4.3.2 Complementary currencies

Complementary currencies also demand a rethink of our economy, but have a more imaginative and radical edge. Because of the difficulties with conventional monetary systems, various alternatives are being tried. These are usually restricted to a particular group of people, and so are called ‘local’ or ‘complementary’ currencies. They are generally based in a local community and enable people to exchange goods and services without resorting to ‘traditional’ currency. Some are
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4.2.3 Business needs sustainability

The second argument is more profound: long-term profitability, and the existence of business itself, is threatened if companies can't transform themselves. This assumes that although the costs of environmental and social impacts can be ignored for a period, in the context of globalisation of environmental, social and political processes, they will come back to haunt businesses, and ultimately threaten their survival. There are several communications and management tools that have been develop
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