Evenwijdig en loodrecht
loodrecht.JPG

Met dit bundeltje leren leerlingen:

  • evenwijdige rechten herkennen;
  • evenwijdige rechten tekenen;
  • loodrechte rechten herkennen;
  • loodrechte rechten construeren.

In de bundel vind je …


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1.3 Chemical compounds

Chemical elements contain atoms of the same atomic number. But most materials consist of chemical compounds. These are a combination of the atoms of two or more chemical elements. Such combinations often occur in simple numerical ratios. Thus, when sodium metal (Figure 2b) and chlorine gas (
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Introduction

You may be studying this unit because you – or a member of your family or a friend – have been personally affected by cardiovascular diseases in some way. You may be professionally involved in looking after people with one of these diseases. Perhaps you are interested in health issues in general. Whatever your motivation or underlying reasons for studying this unit, you will gain valuable insights into the extent of cardiovascular diseases and their treatment in the early twenty-first cen
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1.2 Units of measurement

In the UK, two systems of units are in common use. We still use old imperial measures for some things: milk is sold in pints and signposts indicate distances in miles. But for many other everyday measurements metric units have been adopted: we buy petrol in litres and sugar in kilogram bags. A great advantage of metric units is that we no longer have to convert laboriously from imperial units, such as gallons, feet and inches, in order to trade with continental Europe. Also, calculations are
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Finding information in mathematics and statistics
This unit will help you to identify and use information in maths and statistics, whether for your work, study or personal purposes. Experiment with some of the key resources in this subject area, and learn about the skills which will enable you to plan searches for information, so you can find what you are looking for more easily. Discover the meaning of information quality, and learn how to evaluate the information you come across. You will also be introduced to the many different ways of organ
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5.3 Powers

Having discussed nth roots, we are now in a position to define the expression ax, where a is positive and x is a rational power (or exponent).

Definition

If a > 0, m Author(s): The Open University

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6.2 Getting the feel of big and small numbers

Very small and very large numbers can be difficult to comprehend. Nothing in our everyday experience helps us to get a good feel for them. For example numbers such as 1099 are so big that if Figure 1 was drawn to scale, you would be dealing with enormous distances. How big is big?

First express 1 000 000 000 in scientific notation as 109. Next, to find out how many times bigger 1099 is, use your calculator to divide 1099 by 109
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5.3 Check the till VAT

Now return to the old till receipt and look at the section which deals with VAT.

VAT-CODE NET-VAL VAT-VAL
S=17.5% £8.04 £1.41

These three pieces of information might be read as follows:

  • <
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2.2 Setting the number of decimal places

Calculators have different ways of fixing the number of decimal places displayed on the screen. So you may need to check your calculator instruction booklet here. Some calculators use the FIX function and others use a SETUP or key.

To set the number of decima
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Points to note

Here are a few points from the Exercise 1:

  • The negative or minus sign for the answer 2 maybe slightly smaller and higher than the one used for subtraction in 5 − 7. There maybe two minus keys on your calculator keypad, as there are on the TI-84. The one which means do the operation subtract is Author(s): The Open University

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Unit summary and outcomes

This unit introduced the varied components that you will use to learn mathematics: a calculator, reader articles, audio and video clips. You have mainly been working from this unit's text and the Calculator Book.

A number of activities involved communicating your ideas: the meaning of mathematical terms; where you can ‘see’ mathematics in everyday settings; reviewing how you have studied this material. Writing is one aspect of communication which is central to learning. So it
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3.2 Using scientific notation

Scientific notation can be very useful when estimating the answers to calculations involving very large and/or small decimal numbers.

Example 9

A lottery winner won £7851 000. He put the money straight into a deposit account which earns 7.5% interest per annum (i.e. each year). If he wanted to
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