Learning outcomes

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

  • work with simple ratios;

  • convert between fractions, decimals and percentages;

  • explain the meaning of ratio, proportion and percentage;

  • find percentages of different quantities;

  • calculate percentage increases and decreases;

  • calculate average speeds in given units and find speeds, distances and times for travel at constant speed;

  • convert units;
    Author(s): The Open University

    License information
    Related content

    Except for third party materials and/or otherwise stated (see terms and conditions) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Share

2.3.3 Differences between people and places

I said at the beginning of this section that the average individual and household carbon footprints for a country conceal the differences within that country. These differences in carbon footprints are related to income and can be enormous, but difficult to quantify.

For example, in India the 2004 average carbon footprint of 1.2 tonnes CO2 per person per year hides the differences between: middle-class Indian households living in air-conditioned apartments and owning a televi
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Isaac Newton and his enemies

Professor David Wolfe