Contents 1 Decimals 2 Ratio 3 Percentages 4 Percentage increase 5 Percentage decrease 6 Direct proportion 7 Inverse proportion 8 Exponents 9 Solving equations containing exponents 10 Converting between ordinary numbers and scientific notation 11 Scientific notation: Worded questions 12 Formulae: Substitution 13 Solving equations containing brackets 14 Solving simultaneous linear equations by elimination 15 Solving simultaneous linear equations by substitution 16 Challenge: Solving puzzles using simultaneous equations 17 Simultaneous equations: Worded questions 18 Solving quadratic equations 19 Linear programming: Formulating inequalities 20 Linear programming: Representing an inequality graphically 21 Linear programming: Drawing the feasible region 22 Linear programming: Maximum and minimum values 23 Parabolas 24 Inverse proportion graphs 25 Interpreting graphs 26 Simple interest: Accumulated amount 27 Simple interest: Initial amount 28 Simple interest: Interest rate and investment period 29 Compound interest: Accumulated amount 30 Compound interest: Initial amount 31 Compound interest: Interest rate and investment period 32 Compound interest: Interest compounded half- yearly, quarterly or monthly 33 Annuities 34 Paying instalments 35 Taxation 36 Exchange rates 37 Profit and loss 38 Calculating the break-even point 39 Reading off the break-even point 40 Profit margin 41 Scales on maps 42 Directions and bearings 43 The Theorem of Pythagoras 44 The Theorem of Pythagoras: Compound figures 45 Perimeter and area of a square 46 Perimeter and area of a rectangle 47 Area of a parallelogram 48 Area of a triangle 49 Area of a trapezium 50 Area of a kite and a rhombus 51 Combined areas 52 Circumference and area of a circle 53 Combined areas involving circles 54 Application of perimeter and area 55 Surface area and volume of a cube and a 56 Surface area of a triangular prism 57 Volume of a triangular prism 58 Volumes of prisms: Mixed questions 59 Surface area of a cylinder 60 Volume of a cylinder 61 Surface area and volume: Mixed questions 62 Pictograms 63 Bar graphs 64 Histograms and broken-line graphs 65 Pie charts: Calculating angles 66 Pie charts: Calculating quantities 67 Broken-line graphs 68 Scatter plots 69 Central tendency: Mean and median 70 Central tendency: Mode and range 71 Quartiles 72 Percentiles 73 Theoretical probability 74 Probabilities adding up to 1 75 Experimental probability 76 Listing outcomes 77 Two-way tables 78 The sum rule (OR rule) 79 The product rule (AND rule) 80 Tree diagrams 81 Answers