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Basic Mathematics: Teach Yourself by Alan Graham

By Alan Graham

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Extra resources for Basic Mathematics: Teach Yourself

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The magic number machine 13 Saying hello to your calculator Most basic calculators look something like this. 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 ).

First, multiply by 10 by putting a zero in the units column. 5 4 × 3 7 3 52 8 0 Multiply the unit digit (4) by 3 (4 × 3 = 12). Write down the 2 in the tens column and carry the 1 hundred over to the hundreds column (shown here by a small ‘1’ below the 3). 5 × 3 3 52 12 Multiply the tens digit (5) by 3 (5 × 3 = 15). Write down the 5 in the hundreds column and carry the 1 thousand over to the thousands column (shown here by a ‘1’ in the previously empty thousands column). This completes the ‘multiplying by 3 tens’ part.

1 will give you practice at deciding whether a number is even or odd. 1 Even or odd? For each number, mark the box corresponding to whether it is even or odd. The first one has been done for you. Number 11 Even × Odd 7 2 12 8 6 3 1 0 PRIME, RECTANGULAR AND SQUARE Now choose six of the coins. Notice that they can be arranged in a rectangle as two rows of three, like this: 28 or as three rows of two, like this: Either way, six is a rectangular number because it can be arranged in the form of a rectangle.

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