## Activity 17

Express each of the following percentages as fractions:

• (a) 40%

• (b) 8%

• (c) 70%

• (d)
Author(s): The Open University

## Activity 14

A piece of computer software is to be developed by a team of programmers. It is estimated that a team of four people would take a year. Which of the following times is the length of time taken by three program
Author(s): The Open University

## Activity 5

Convert each of the following fraction ratios to decimal ratios.

• (a) Author(s): The Open University

Although ratios are often given as fractions, they can also be expressed as decimals. You need to deal with a mixture of fractions and decimals, and to compare ratios given in either form, so you need to be able to convert between the two forms.

## Example 4

The ratio of the circ
Author(s): The Open University

Time conversions are also ratios. The ratio of time measured in minutes to time measured in seconds is one to sixty (1:60), as there are sixty seconds in a minute.

## Example 2

Adam's grandfather ran a mile in
Author(s): The Open University

To make short crust pastry, one recipe book says â€˜use one part of fat to two parts of flourâ€™; another recipe says â€˜use fat and flour in the ratio of one to twoâ€™; and yet another says â€˜use half as much fat as flourâ€™. These are different ways of expressing the same ratio. Ratios are often expressed as fractions. So in this case:

Author(s): The Open University

The content acknowledged below is Proprietary (see and conditions made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence) and used under licence.

Course image: rod
Author(s): The Open University

Ahmed, A. (1987) Better Mathematics, London, HMSO.
DfEE (2001) Key Stage 3 National Strategy: Framework for Teaching Mathematics: Years 7, 8 and 9, London, DfEE.
NCTM (1989) Curriculum and Evaluation Standards for School Mathematics Reston VA, National Council of Teachers of Mathematics.

Author(s): The Open University

In this course you have been introduced to the difference between mathematical content and processes. You have worked on the doâ€“talkâ€“record (DTR) framework for learning mathematics.

Author(s): The Open University

You will come to this course with many memories of mathematics, both as a teacher and a learner. It may help if you start by recalling memories of learning mathematics and making a record of them in your notebook.

When you work on a task, get into the habit of having your notebook to hand to record your thinking. Use the notebook in any way that helps you to think about the work you have done. Some people find it helpful to divide a page into two columns using the left-hand side to reco
Author(s): The Open University

You should not expect always to be able to read a problem and then just write down the answer. When you are faced with a written mathematical question or problem to solve, read it carefully. It is important that you get to grips with the question in two ways: first, that you absorb the information given; and second, that you find out what the question is really asking. Your solution will link the two. This method can be summarised by the following questions.

Author(s): The Open University

Environment: journeys through a changing world
Genetically, mountain gorillas are amongst our closest living relatives, and also one of the world's most endangered species. Half the world's remaining population survive in the forests of Uganda. This album explores the challenges facing conservationists at Bwindi Impenetrable National Park. Known for its exceptional biodiversity, the Park became a major tourist destination when it opened for gorilla tourism in 1993. The problem is, because the Park lies in the heart of one of the most densely
Author(s): The OpenLearn team

Earth in crisis: environmental policy in an international context
This innovative album introduces one of the biggest, and most complex, of todayâ€™s environmental problems â€“ climate change. It features the hard-hitting, "Who Will Pay", selected as a finalist in an international film competition on "Vulnerability Exposed: The Social Dimensions of Climate Change" organised by the World Bank. This 'Earth in Crisis' album offer a sophisticated understanding of the processes and players that shape contemporary international environmental problems, evaluates wha
Author(s): The OpenLearn team

Environment: habitat and conservation
The relationship between sea and land has always been one of dynamic change. Yet, as rising sea levels threaten habitats for wildlife and humans alike, we are today more vulnerable than ever. The 11 video tracks on this album address the complexities of environmental change, focusing on the Blackwater Water Estuary in Essex where a coastal retreat scheme is in operation, managed biodiversity at Wicken Fen in Cambridgeshire, and the search for sustainable forms of development along the River Seve
Author(s): The OpenLearn team

Water in Ethiopia
In Ethiopia, 65% of people donâ€™t have access to clean drinking water. In this album we take a glimpse at the struggles Ethiopians go through each day, just to survive. We look closely at the different methods used to improve the quality of life in the rural highlands as well as the conflict between neighbouring farming villages attempting to share the same water supply. This material forms part of the course U116 Environment: journeys through a changing world.Author(s): The OpenLearn team

Bottled Water
Have you ever wondered where bottled water comes from and what impact this has on the environment? This informative, animated video looks at the complete process of producing bottled water and strives to answer the question, 'Bottled water - who needs it?' Highlighting the effects this has on the carbon footprint, we learn how bottled water is disseminated worldwide. This material forms part of the course U116 Environment: journeys through a changing world.Author(s): The OpenLearn team

War, Intervention and Development
How can we prevent a country from returning to civil war? When and how should external parties intervene in serious conflicts? This album looks at the decade of violence and destruction that occurred in Sierra Leone in the 1990's. Now that peace has finally come about through the efforts of the international community, it's time to debate whether the root causes of war have been adequately addressed, and what lessons can be learned. 50% of Sierra Leoneans are under 15 and unskilled. Lack of edu
Author(s): The OpenLearn team

Environmental responsibility
Complex questions of environmental responsibility are increasingly raised in times of change and uncertainty. The tracks on this album illustrate the need for nurturing a fresh sense of care for our environment as well as more appropriate forms of accountability. We demonstrate the necessity of addressing issues of entitlements, rights, obligations and duties if we are to critically and carefully shape our values in doing environmental responsibility and being environmentally responsible. This m
Author(s): The OpenLearn team

Culture and Climate Change
Every generation faces challenges that previous generations could scarcely imagine. Twenty years ago, few people were talking about climate change, now it's one of the most hotly-contested areas in politics. How do artists, writers, musicians and broadcasters respond when a new subject appears that is as large and significant as this? What kind of novels, plays, paintings, sculptures, movies and music begin to emerge?Author(s): The OpenLearn team

Enacting European Citizenship (ENACT)
The term 'European citizenship' triggers an immediate association with the European Union, its member states, and people who are citizens of those states. This free course, Enacting European Citizenship (ENACT), develops another way of thinking about European citizenship whereby European citizenship need not be granted by the state, limited to the territory within the EU borders or acted out by people who are already citizens. Author(s): Creator not set