Table of Contents
Introduction 4
1 Percentages 6
1.1 Simple interest 7
1.2 Percentage increases and decreases 10
1.3 Calculating the original value 14
1.4 Using percentages 17
Ready to progress? 20
Review questions 20
Challenge
Exponential growth 22
2 Equations and formulae 24
2.1 Multiplying out brackets 25
2.2 Factorising algebraic expressions 27
2.3 Equations with brackets 29
2.4 Equations with fractions 32
2.5 Rearranging formulae 35
Ready to progress? 38
Review questions 38
Investigation: Body mass index 40
3 Polygons 42
3.1 Angles in polygons 43
3.2 Constructions 47
3.3 Angles in regular polygons 51
3.4 Regular polygons and tessellations 53
Ready to progress? 56
Review questions 56
Activity: Garden design 58
4.1 Scatter graphs and correlation 61
4.2 Time-series graphs 65
4.3 Two-way tables 71
4.4 Comparing two or more sets of data 74
4.5 Statistical investigations 77
Ready to progress? 80
Review questions 80
Challenge: Rainforest deforestation 82
5 Applications of graphs 84
5.1 Step graphs 85
5.2 Time graphs 89
5.3 Exponential growth graphs 93
Ready to progress? 96
Review questions 96
Problem solving: Mobile phone tariffs 98
6 Pythagoras' theorem 100
6.1 Introducing Pythagoras' theorem 101
6.2 Calculating the length of the hypotenuse 102
6.3 Calculating the length of a shorter side 105
6.4 Using Pythagoras' theorem to solve problems 108
Ready to progress? 112
Review questions 112
Activity: Practical Pythagoras 114
7 Fractions 116
7.1 Adding and subtracting fractions 117
7.2 Multiplying fractions 119
7.3 Multiplying mixed numbers 121
7.4 Dividing fractions and mixed numbers 123
Ready to progress? 126
Review questions 126
Investigation: Fractions from one to six 128
8 Algebra 130
8.1 More about brackets 131
8.2 Factorising expressions containing powers 133
8.3 Expanding the product of two brackets 134
Ready to progress? 138
Review questions 138
Challenge: Graphs from expressions 140
9 Decimal numbers 142
9.1 Powers of 10 143
9.2 Standard form 146
9.3 Rounding appropriately 149
9.4 Mental calculations 152
9.5 Solving problems 155
Ready to progress? 158
Review questions 158
Mathematical reasoning: Paper 160
10 Prisms and cylinders 162
10.1 Metric units for area and volume 163
10.2 Volume of a prism 165
10.3 Surface area of a prism 168
10.4 Volume of a cylinder 172
10.5 Surface area of a cylinder 174
Ready to progress? 178
Review questions 178
Problem solving: Packaging cartons of fruit juice 180
11 Solving equations graphically 182
11.1 Graphs from equations in the form ay ± bx = c 183
11.2 Graphs from quadratic equations 185
11.3 Solving quadratic equations by drawing graphs 188
11.4 Solving simultaneous equations by graphs 190
Ready to progress? 192
Review questions 192
Challenge: Linear programming 194
12 Compound units 196
12.1 Speed 197
12.2 More about proportion 201
12.3 Unit costs 204
Ready to progress? 208
Review questions 208
Challenge: Population density 210
13 Right-angled triangles 212
13.1 Introducing trigonometric ratios 213
13.2 How to find trigonometric ratios of angles 216
13.3 Using trigonometric ratios to find angles 219
13.4 Using trigonometric ratios to find lengths 223
Ready to progress? 226
Review questions 226
Investigation: Barnes Wallis and the bouncing bomb 228
14 Revision and GCSE preparation 230
Practice 231
Revision 243
GCSE-type questions 250
Glossary 253
Index 255