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Primary arithmetic is a goal written distance studying textual content initially produced as Passport to arithmetic via The Open University's Centre for arithmetic schooling. In its new shape it includes extra audit fabric to help trainee lecturers.

The task-driven textual content emphasizes suggestions and techniques and is particularly various from the standard kind of arithmetic textbooks. all the sections is designed to stand-alone so that it will be studied in any order. Trainees have stated that the cloth not just helped them to elevate their wisdom and knowing to the mandatory commonplace but in addition drastically more advantageous their mathematical self belief.

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**Sample text**

15, and then calculated in the same way as any other percentage. 9. You should check that this gives the same result as the two-stage method. Task 26 VAT On many bills, for example in restaurants, VAT is added at 17 21 % and sometimes also a service charge of 15%. Does it make any difference to what you have to pay if the VAT is added first then the service charge, or vice versa? Make up some examples to try. Remember to keep them simple. The examples are special cases; from these examples you are trying to work out what will always happen – the general case.

Units of measurement In the UK there are three systems of units of measurement in use: imperial, metric and SI (Système Internationale). When imperial measures were first used they were based on the sort of amounts that people commonly used, or on parts of the human body. This means that the relationships between units are unplanned and seem very arbitrary. By contrast, the metric system was designed as a whole with the relationships between units following a logical pattern. SI units are a version of metric units constructed to make international communication easier, especially in science and engineering.

A sprinter’s speed may be quoted in metres per second; a child’s growth in centimetres per year. Each of these units are given as: unit of distance per unit of time Other examples of rates are: density, measured in grams per cubic centimetre; rate of flow, measured in litres per minute; fuel consumption, measured in miles per gallon. It is usual in imperial units to abbreviate miles per hour as mph, or miles per gallon as mpg. In the metric and SI systems ‘p’ is not used as an abbreviation for ‘per’.