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First-order differential equations
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Except for third party materials and otherwise stated (see http://www.open.ac.uk/conditions terms and conditions), this content is made available under a http://creativecommons.org/licenses/by-nc-sa/2

3.2 Arithmetic with whole numbers

When you are adding or subtracting whole numbers, an important thing to keep in mind is the place value of the figures. It is often a good idea to set out the numbers in columns before doing the arithmetic.

Example 11

  • (a) There are 4985 people living
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2.1.1 Which units to use

It is important to choose appropriate units, both to have a sense of the size you are talking about and also to avoid having to deal with very large or very small numbers.

For example using the UK decimal system, where £1 = 100p (one pound is equivalent to 100 pence), you would probably use pence for prices less than a pound: 50p rather than £0.50 and pounds for larger amounts, e.g. £2.50 instead of 250p.

For distance, mass and liquid measures, the metric system of units
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2.1 Introduction

Numbers are used to count things (such as 54 sheep in a field) or, together with units of measurement, to quantify something (such as a 2-litre water bottle or a 3-year waiting list for an operation). This section reminds you of some units of measurement and considers appropriate units to use. We also need to make comparisons between quantities given in different units.


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Try some yourself

1 Contour lines on a map show all the points at a given height above sea level. The lines are drawn for each height at 50-metre intervals, and points below sea level are shown by negative heights. The diagram below shows a peak with six suc
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3.1.1 Inserting half-twists

We can insert half-twists into a paper surface whenever a piece of the surface is homeomorphic to a rectangle ABCD with the following properties:

the edges AB and CD of the rectangle map to distinct parts of the boundary of the surface, and the edges BC and DA of the rectangle map to non-boundary points of the surface.

As illustrated in Author(s): The Open University

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.

Don't miss out:

1. Join over 200,000 students, currently studying with The Open University [http://www.open.ac.uk/Author(s): The Open University

3.2.2 The protection of intellectual property: the costs of TRIPS

Apart from the internal redistribution of income resulting from greater exposure to the world economy, the effects of one of the UR agreements in particular have achieved a certain notoriety because the agreement clearly imposes huge costs on farmers and consumers in developing countries, to the benefit of corporations in developed countries. This is the agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS), which strengthens international rules governing patents, tradema
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8.3.1 Fluorine-based etching of silicon

Given the noxious chemistry needed to etch silicon with a liquid, it is perhaps surprising that a gas can do the job at all. However, both xenon fluoride (XeF2) and chlorine trifluoride (ClF3) gases have been used successfully for just this purpose. Each acts as a source of fluorine atoms, which are just barely bound together into molecules and are easily rearranged around silicon atoms with which they form strong bonds, turning them into inert SiF4 gas. These
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Glossary

Open glossary now...


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Next steps

After completing this unit you may wish to study another OpenLearn Study Unit or find out more about this topic. Here are some suggestions:

If you wish to study formally at The Open University, you may wish to explore the courses we offer in this curriculum area:

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