By Alan Graham
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Extra resources for Basic Mathematics: Teach Yourself
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.