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**NEW (see changelog for past updates)**

**23rd October 2019: R10 – Inverse and direct proportions 1 worksheet**

Select a topic from the syllabus below, using the quick links provided:

1. Number

– Fractions, decimals and percentages

– Measures and accuracy

2. Algebra

– Graphs

– Solving equations and inequalities

– Sequences

3. Ratio, proportion and rates of change

4. Geometry and measures (under construction)

– Mensuration and calculation (under construction)

– Vectors (under construction)

5. Probability (under construction)

6. Statistics (under construction)

### 1. Number

What students need to learn:

N1 order positive and negative integers, decimals and fractions; use the symbols =, ≠, <, >, ≤, ≥

N7 calculate with roots, and with integer and fractional indices

N8 calculate exactly with fractions, surds and multiples of π; simplify surd expressions involving squares (e.g. √12 = √(4 × 3) = √4 × √3 = 2√3) and rationalise denominators

N9 calculate with and interpret standard form A × 10^{n}, where 1 ≤ A < 10 and n is an integer

#### Fractions, decimals and percentages

N11 identify and work with fractions in ratio problems

N12 interpret fractions and percentages as operators

#### Measures and accuracy

N15 round numbers and measures to an appropriate degree of accuracy (e.g. to a specified number of decimal places or significant figures); use inequality notation to specify simple error intervals due to truncation or rounding

N16 apply and interpret limits of accuracy, including upper and lower bounds

### 2. Algebra

What students need to learn:

A1 use and interpret algebraic manipulation, including:

• ab in place of a × b

• 3y in place of y + y + y and 3 × y

• a^{2} in place of a × a, a^{3} in place of a × a × a, a^{2}b in place of a × a × b

• a/b in place of a ÷ b

• coefficients written as fractions rather than as decimals

• brackets

A2 substitute numerical values into formulae and expressions, including scientific formulae

A4 simplify and manipulate algebraic expressions (including those involving surds **and algebraic fractions**) by:

● collecting like terms

● multiplying a single term over a bracket

● taking out common factors

● expanding products of two **or more** binomials

● factorising quadratic expressions of the form x^{2} + bx + c, including the difference of two squares; **factorising quadratic expressions of the form ax ^{2} + bx + c**

● simplifying expressions involving sums, products and powers, including the laws of indices

A5 understand and use standard mathematical formulae; rearrange formulae to change the subject

A6 know the difference between an equation and an identity; argue mathematically to show algebraic expressions are equivalent, and use algebra to support and construct arguments **and proofs**

A7 where appropriate, interpret simple expressions as functions with inputs and outputs; **interpret the reverse process as the “inverse function”; interpret the succession of two functions as a ‘composite function’ (the use of formal function notation is expected)**

#### Graphs

A8 work with coordinates in all four quadrants

A13 sketch translations and reflections of a given function

A15 calculate or estimate gradients of graphs and areas under graphs (including quadratic and other non-linear graphs), and interpret results in cases such as distance-time graphs, velocity-time graphs and graphs in financial contexts (this does not include calculus)

A16 recognise and use the equation of a circle with centre at the origin; find the equation of a tangent to a circle at a given point

#### Solving equations and inequalities

A20 find approximate solutions to equations numerically using iteration

A21 translate simple situations or procedures into algebraic expressions or formulae; derive an equation (or two simultaneous equations), solve the equation(s) and interpret the solution

A22 solve linear inequalities in one or two variable(s), and quadratic inequalities in one variable; represent the solution set on a number line, using set notation and on a graph

#### Sequences

A23 generate terms of a sequence from either a term-to-term or a position-to-term rule

A24 recognise and use sequences of triangular, square and cube numbers, simple arithmetic progressions, Fibonacci type sequences, quadratic sequences, and simple geometric progressions (r^{n} where n is an integer, and r is a rational number > 0 or a surd) and other sequences

A25 deduce expressions to calculate the nth term of linear and quadratic sequences

### 3. Ratio, proportion and rates of change

What students need to learn:

R2 use scale factors, scale diagrams and maps

R4 use ratio notation, including reduction to simplest form

R6 express a multiplicative relationship between two quantities as a ratio or a fraction

R7 understand and use proportion as equality of ratios

R8 relate ratios to fractions and to linear functions

R11 use compound units such as speed, rates of pay, unit pricing, density and pressure

R12 compare lengths, areas and volumes using ratio notation; make links to similarity (including trigonometric ratios) and scale factors

R13 understand that X is inversely proportional to Y is equivalent to X is proportional to 1/Y; construct and interpret equations that describe direct and inverse proportion

R14 interpret the gradient of a straight line graph as a rate of change; recognise and interpret graphs that illustrate direct and inverse proportion

R15 interpret the gradient at a point on a curve as the instantaneous rate of change; apply the concepts of average and instantaneous rate of change (gradients of chords and tangents) in numerical, algebraic and graphical contexts (this does not include calculus)

R16 set up, solve and interpret the answers in growth and decay problems, including compound interest and work with general iterative processes

### 4. Geometry and measures

What students need to learn:

G1 use conventional terms and notation: points, lines, vertices, edges, planes, parallel lines, perpendicular lines, right angles, polygons, regular polygons and polygons with reflection and/or rotation symmetries; use the standard conventions for labelling and referring to the sides and angles of triangles; draw diagrams from written description

G2 use the standard ruler and compass constructions (perpendicular bisector of a line segment, constructing a perpendicular to a given line from/at a given point, bisecting a given angle); use these to construct given figures and solve loci problems; know that the perpendicular distance from a point to a line is the shortest distance to the line

G3 apply the properties of angles at a point, angles at a point on a straight line, vertically opposite angles; understand and use alternate and corresponding angles on parallel lines; derive and use the sum of angles in a triangle (e.g. to deduce and use the angle sum in any polygon, and to derive properties of regular polygons)

G4 derive and apply the properties and definitions of special types of quadrilaterals, including square, rectangle, parallelogram, trapezium, kite and rhombus; and triangles and other plane figures using appropriate language

G5 use the basic congruence criteria for triangles (SSS, SAS, ASA, RHS)

G6 apply angle facts, triangle congruence, similarity and properties of quadrilaterals to conjecture and derive results about angles and sides, including Pythagoras’ theorem and the fact that the base angles of an isosceles triangle are equal, and use known results to obtain simple proofs

G7 identify, describe and construct congruent and similar shapes, including on coordinate axes, by considering rotation, reflection, translation and enlargement (including fractional and negative scale factors)

G8 describe the changes and invariance achieved by combinations of rotations, reflections and translations

G9 identify and apply circle definitions and properties, including: centre, radius, chord, diameter, circumference, tangent, arc, sector and segment

G10 apply and prove the standard circle theorems concerning angles, radii, tangents and chords, and use them to prove related results

G11 solve geometrical problems on coordinate axes

G12 identify properties of the faces, surfaces, edges and vertices of: cubes, cuboids, prisms, cylinders, pyramids, cones and spheres

G13 construct and interpret plans and elevations of 3D shapes

#### Mensuration and calculation

G14 use standard units of measure and related concepts (length, area, volume/capacity, mass, time, money, etc.)

G15 measure line segments and angles in geometric figures, including interpreting maps and scale drawings and use of bearings

G16 know and apply formulae to calculate: area of triangles, parallelograms, trapezia; volume of cuboids and other right prisms (including cylinders)

G17 know the formulae: circumference of a circle = 2πr = πd, area of a circle = πr2; calculate: perimeters of 2D shapes, including circles; areas of circles and composite shapes; surface area and volume of spheres, pyramids, cones and composite solids

G18 calculate arc lengths, angles and areas of sectors of circles

G19 apply the concepts of congruence and similarity, including the relationships between lengths, areas and volumes in similar figures

G20 know the formulae for: Pythagoras’ theorem a^2+b^2=c^2, and the

trigonometric ratios, sinθ=opposite/hypotenuse, cosθ=adjacent/hypotenuse, and tanθ=opposite/adjacent; apply them to find angles and lengths in right-angled triangles and, where possible, general triangles in two and three dimensional figures

G21 know the exact values of sin θ and cos θ for θ = 0°, 30°, 45°, 60° and 90°;

know the exact value of tan θ for θ = 0°, 30°, 45° and 60°

G22

know and apply the sine rule a/(sin A)=b/(sin B)=c/(sin C) , and cosine rule a^2=b^2+c^2-2bc cos A , to find unknown lengths and angles

G23 know and apply Area = 1/2ab sin C to calculate the area, sides or angles of any triangle

#### Vectors

G24 describe translations as 2D vectors

G25 apply addition and subtraction of vectors, multiplication of vectors by a scalar, and diagrammatic and column representations of vectors; use vectors to construct geometric arguments and proofs

### 5. Probability

What students need to learn:

P1 record, describe and analyse the frequency of outcomes of probability experiments using tables and frequency trees

P2 apply ideas of randomness, fairness and equally likely events to calculate expected outcomes of multiple future experiments

P3 relate relative expected frequencies to theoretical probability, using appropriate language and the 0-1 probability scale

P4 apply the property that the probabilities of an exhaustive set of outcomes sum to one; apply the property that the probabilities of an exhaustive set of mutually exclusive events sum to one

P5 understand that empirical unbiased samples tend towards theoretical probability distributions, with increasing sample size

P6 enumerate sets and combinations of sets systematically, using tables, grids, Venn diagrams and tree diagrams

P7 construct theoretical possibility spaces for single and combined experiments with equally likely outcomes and use these to calculate theoretical probabilities

P8 calculate the probability of independent and dependent combined events, including using tree diagrams and other representations, and know the underlying assumptions

P9 calculate and interpret conditional probabilities through representation using expected frequencies with two-way tables, tree diagrams and Venn diagrams

### 6. Statistics

What students need to learn:

S1 infer properties of populations or distributions from a sample, while knowing the limitations of sampling

S2 interpret and construct tables, charts and diagrams, including frequency tables, bar charts, pie charts and pictograms for categorical data, vertical line charts for ungrouped discrete numerical data, tables and line graphs for time series data and know their appropriate use

S3 construct and interpret diagrams for grouped discrete data and continuous data, i.e. histograms with equal and unequal class intervals and cumulative frequency graphs, and know their appropriate use

S4 interpret, analyse and compare the distributions of data sets from univariate empirical distributions through:

● appropriate graphical representation involving discrete, continuous and grouped data, including box plots

● appropriate measures of central tendency (median, mean, mode and modal class) and spread (range, including consideration of outliers quartiles and inter-quartile range)

S5 apply statistics to describe a population

S6 use and interpret scatter graphs of bivariate data; recognise correlation and know that it does not indicate causation; draw estimated lines of best fit; make predictions; interpolate and extrapolate apparent trends while knowing the dangers of so doing