# Heather Cooke's Primary Mathematics (Developing Subject Knowledge series) PDF

By Heather Cooke

ISBN-10: 0761971173

ISBN-13: 9780761971177

ISBN-10: 0761971181

ISBN-13: 9780761971184

ISBN-10: 1847879497

ISBN-13: 9781847879493

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Extra info for Primary Mathematics (Developing Subject Knowledge series)

Example text

The 8) or the number after it (the 2). This needs to be checked out carefully for any new calculator you use, as it varies from model to model. To find out which type you have, carry out the following sequences: 8 – 2 = = = = … 8 × 2 = = = = … 8 ÷ 2 = = = = … Using the constant facility Below are some key sequences for you to try. They assume the doublepress constant. If your calculator constant operates differently, the key sequences will need to be adapted. (a) Pressing 10 45, … This method is used later in converting units of measurement.

Small numbers very close to zero can also be formed in this way. For example, set up your calculator constant facility to divide by 10, enter a simple starting value, say 43, and then repeatedly press the Methods of using your calculator constant facility are explained on pages 29–30. = key. 3 09, … . 0 −99. There is still a very small gap between this number and zero. However, even within this extremely small region, an infinity of numbers exist! A version of roughly what the scientific calculator number line might look like is shown below.

E. as 2 + 12). The algebra example, when the a is replaced by 4, produces the same calculation, namely 2 + 3 × 4. This time the answer of 14 is inescapable, because the rules of algebra dictate that the multiplication of 3 × 4 must be completed before the 2 is added. So, what will your calculator make of 2 + 3 × 4? Calculators, unfortunately, are not programmed to interpret dramatic pauses and changes of intonation when given instructions to perform a calculation. They will simply calculate according to the rules with which they have been programmed.