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Using Numbers A guide

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Calculations About half the Part A questions are calculations. These will usually involve Identifying an appropriate formula/equation Rearranging the equation to make the desired answer the subject Substituting numbers in the equation and calculating a result You may, on occasions be asked to interpret the answer.

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Calculations – some hints The answer to a calculation represents an actual quantity, so you must include units Beware excess precision. The data does not justify a final answer of more than 3 or 4 significant figures You should perform calculations at the precision of your calculator then round the final answer to not more than four figures

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Calculations – more hints You will be dealing with very large numbers so be familiar with and use scientific notation (aka standard form) e.g. 3.4 x 10 12 Joules. Also be familiar with SI unit prefixes (kilo-, mega-, tera- etc.) Be clear on the distinction between kilowatts and kilowatt-hours. (see units handout)

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Using Numbers In addition to performing calculations you will be expected to Interpret the significance of numerical data Use numerical data in the support of arguments Such data is likely to be In tables In graphs and charts The result of calculations

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Sources of Maths Help Science Good Study Guide T206 CDROM has a maths guide. You will need to install the CD's contents on your hard drive to make this available

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