Basic Mathematics: Teach Yourself by Alan Graham
By Alan Graham
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Extra resources for Basic Mathematics: Teach Yourself
Display screen the ‘off’ key the number pad the ‘on’ and ‘clear’ key % OFF the ‘divide’ key ÷ MRC M– M+ 7 8 9 _ 4 5 6 + the ‘add’ key 1 2 3 = the ‘equals’ key ON/C 0 zero the ‘multiply’ key the ‘subtract’ key the ‘decimal point’ Before we tackle the hard stuff, you should start by saying hello to your calculator. Usual etiquette is as follows. ᭤ ᭤ ᭤ 14 Press the ‘On’ switch (probably marked ON or ON/C ). 7734 Turn your calculator upside down and read its response on the screen. Good! Having now exchanged ‘hELLOs’, this is clearly the basis for a good working relationship!
B Set up your calculator constant to ‘add 7’ and repeat the exercise given in part (a). Then, without switching off the constant, key in a different number (say, 2) and repeat by pressing = = = … c Now try something more challenging, such as setting the calculator constant to ‘add 17’ or ‘add 23’. 3. Calculating with numbers 33 How would you react to adding, say, 19 and 49 in your head? Many people ﬁnd this hard, but here’s a tip. e. 5. 5 Speed addition Use the tip shown opposite to do these additions: a 28 + 39 b 21 + 59 c 19 + 38 + 9 Insight Carl Friedrich Gauss (1777–1855) was a precocious mathematical talent from an early age.
7 Practising subtraction Now, don’t press any of the operation keys or the Clear key as this will switch off the constant. a Press 84 followed by = = = … But this time, try to guess each answer before it is displayed. b Set up your calculator constant to ‘subtract 7’ and repeat the exercise given in part (a). Then, without switching off the constant, key in a different starting number (say, 215) and repeat by pressing = = = … c Now try subtracting larger numbers using the calculator constant. 3.