How_To_Be_Good_At_Math
NUMBERS • DECIMAL NUMBERS 59 3 4 0. 75 Rewriting fractions as decimals To rewrite a fraction as a decimal, we first turn it into ...
60 NUMBERS •^ COMPARING AND ORDERING DECIMALS Comparing and ordering decimals When we compare or order decimals, we use what we ...
NUMBERS • ROUNDING DECIMALS 61 Rounding to one This means that we round a decimal to the nearest whole number. So 1.3 is rounded ...
62 NUMBERS •^ ADDING DECIMALS Adding decimals We add decimals in the same way as we add whole numbers – turn to page 87 to find ...
NUMBERS • SUBTRACTING DECIMALS 63 Subtracting decimals When we subtract decimal numbers, we use the same method as we do for who ...
64 NUMBERS •^ PERCENTAGES Percentages Per cent means “per hundred”. It shows an amount as part of 100. So, 25 per cent means 25 ...
NUMBERS • PERCENTAGES 65 Percentages, decimals, and fractions We can use a percentage, decimal, and fraction to write the same n ...
66 NUMBERS •^ CALCULATING PERCENTAGES Calculating percentages We can find a percentage of any total amount, not just 100. The to ...
NUMBERS • CALCULATING PERCENTAGES 67 10% of 800 A percentage is just another way of writing a fraction. Divide the total amount ...
68 NUMBERS •^ PERCENTAGE CHANGES Percentage changes We can use a percentage to describe the size of a change in a number or a me ...
NUMBERS • PERCENTAGE CHANGES 69 5% of £200 = £10 30% of £250 = £75 Turning a percentage increase into an amount Turning a percen ...
70 NUMBERS •^ RATIO Simplifying ratios As with fractions, we always simplify ratios when we can. We do this by dividing both num ...
NUMBERS • PROPORTION 71 Proportion as a fraction We often write proportion as a fraction. Here are 10 cats. What fraction of the ...
72 NUMBERS •^ SCALING Height 15 cm 12 treats are made with 100 g of chocolate and 80 g of puffed rice Scaling down A photograph, ...
NUMBERS • SCALING 73 Scale on maps Scaling is useful for drawing maps. We couldn’t use a life-size map – it would be too big to ...
74 NUMBERS •^ DIFFERENT WAYS TO DESCRIBE FRACTIONS Fractions, decimals, and percentages are all linked, and we can express one a ...
NUMBERS • DIFFERENT WAYS TO DESCRIBE FRACTIONS 75 Common fractions, decimals, and percentages This table shows the different way ...
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CALCULATING We calculate to solve problems in maths. We can add, subtract, multiply, and divide in our heads or by writing numbe ...
78 CALCULATING •^ ADDITION Addition When we bring two or more quantities together to make a larger quantity, it’s called additio ...
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