There are several symbols for powers and roots: for instance, 24 means ‘2 to the power 4’. An alternative to 24 is 24, where the symbol Author(s): The Open University

1 Read the following expression out aloud or write it out in full in words:

• (a) 3 × 4 + 3 × 5 = 3 (4 + 5).

## Answer<Author(s): The Open UniversityLicense informationRelated contentExcept 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

You will have already met the symbols for the basic arithmetical operations, which are +, −, × and ÷, but you may not have met some of the alternative ways of writing × and ÷.

To recap, the main symbols for arithmetical operations are:

There are other alternati
Author(s): The Open University

1 How would you add the following words to the list:

decimal, fraction, positive, negative.

For each one, give the mathematical meaning and an example of its use.

## Author(s): The Open UniversityLicense informationRelated contentExcept 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

Doing division when decimal numbers are involved is the same as doing divisions involving whole numbers, with a few extra steps to take care of the decimal point.

Either the number you are dividing into or the number you are dividing by, or both of them, may be a whole number or a decimal number. So, for example, you might want to do the following divisions:

• Example 1: 49.26457 ÷ 8
• Example 2: 2.601 ÷ 1.22
• Example 3: 678 ÷ 27.3
Author(s): The Open University

We know that a polygon X is a surface and so each point x in X has a disc-like or half-disc-like neighbourhood. We shall show that a map f that identifies edges of a polygon to create an object Y automatically creates corresponding disc-like or half-disc-like neighbourhoods of each point y = f(x) of Y.

If x is in the interior of X, there is no difficulty: the point x has a disc-like neighbourhood U
Author(s): The Open University

2.4.1 Remarks

1. This theorem applies to all surfaces and not just to surfaces in space.

2. This theorem tells us that the boundary number is a topological invariant for surfaces, i.e. a property that is invariant under homeomorphisms.

3. It follows from the theorem that two surfaces with different boundary numbers cannot be homeomorphic. It does not follow that two surfaces with the same boundary number are homeomorphic –
Author(s): The Open University

Animals at the extremes: The desert environment
Animal life has adapted to survive in the most unlikely and inhospitable habitats. This unit looks at the surprisingly diverse desert climates throughout the world and mammals, birds, lizards and amphibians that survive there. It splits these animals into three groups according to their strategy for survival: evaders, evaporators and endurers, then discusses how these strategies work on a biochemical and physiological level.Author(s): Creator not set

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Reuters Today: Europe deal hands ECB watchdog role
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CO 1069-392-115

The National Archives UK posted a photo:

Date: 1870-1939

Our Catalogue Reference:
Author(s): nobody@flickr.com (The National Archives UK)

Stephen Colbert | "America Again: Re-Becoming the Greatness We Never Weren't"
The uncut interview of Stephen Colbert's visit to Google's New York office. You can find Stephen's book on Google Play here: http://goo.gl/Jyujo . America Again: Re-Becoming the Greatness We Never Weren't is more of a coffee-table book, with large color pictures, and chapter photos that require the use of included 3-D glasses. It falls somewhere between I Am America and the Daily Show faux-textbooks America (The Book) and Earth (The Book), which used that organizing principle to their advantage
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The week ahead: January 18th 2013

Author(s): The Economist

Site Libre Savoirs: Formation CERES-EGC / Training session for the CERES-EGC model
Domaine: Sciences et technologies de l'information et de la communication
Formation "CERES-EGC" Modelling concepts, past, current and future uses. Par Benoît GABRIELLE, Rea Silvia Massad et Pietro Goglio

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Site Libre Savoirs: Le machinisme agricole
Domaine: Sciences de la terre et génie de l'environnement
Ici, vous pourrez compléter vos connaissances sur les outils agricoles, trouver des fiches descriptives de chaque appareil aisin que des présentations sur les principales techniques culturales et sur des thèmes transversaux concernant le machinisme agricole.

Author(s): No creator set

Software development for enterprise systems
Enterprise systems are software applications that automate and integrate all many of the key business processes of an organisation. With some understanding of software development, you will learn about current development practices for this type of system and develop relevant skills to apply them to real-world problems. You will develop core skills in object-oriented analysis and design, allowing you to develop software that is fit for purpose, reusable and amenable to change.Author(s): Creator not set

Promo - One Minute Luxembourgish
Moien - hello! My name is Julie and I'd like to welcome you to One Minute Luxembourgish from the Radio Lingua Network. In this podcast I'm going to be teaching you the basics of Luxembourgish. The great thing about this language course is that you'll be learning all you need to know in just 60 seconds - or thereabouts! Each one-minute language lesson will equip you with just enough Luxembourgish to help you get by in lots of situations, either on holiday, or on a business trip to Luxembourg. One
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North Shore Community Land Trust