**C/1**Understand and use proportionality

**C/2**Calculate the result of any proportional change using multiplicative methods

- http://www.khanacademy.org/math/arithmetic/rates-and-ratios/e/proportions_1
- http://www.khanacademy.org/math/arithmetic/rates-and-ratios/e/proportions_2

**C/3**Understand the effects of multiplying and dividing by numbers between 0 and 1, add, subtract, multiply and divide fractions

**C/4**Make and justify estimates and approximations of calculations; estimate calculations by rounding numbers to one significant figure and multiplying and dividing mentally

**C/5**Use a calculator efficiently and appropriately to perform complex calculations with numbers of any size, knowing not to round during intermediate steps of a calculation

**C/6**Square a linear expression and expand and simplify the product of two linear expressions of the form (x ± n) and simplify the corresponding quadratic equation

**C/7**Use algebraic and graphical methods to solve linear equations in two variables

- http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/e/graphing_systems_of_equations
- http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/e/solutions_to_systems_of_equations
- http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/e/systems_of_equations_with_elimination_0.5
- http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/e/systems_of_equations_with_elimination
- http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/e/systems_of_equations_with_substitution

**C/8**Solve inequalities in one variable and represent the solution set on a number line

- http://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/e/inequalities_on_a_number_line
- http://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/e/one_step_inequalities

**C/9**Use formulae from mathematics and other subjects; substitute numbers into expressions and formulae; derive a formulae and, in simple cases, change its subject

**C/10**Find the next term and nth term of quadratic sequences and functions and explore their properties

**C/11**Plot graphs of simple quadratic and cubic functions, e.g. y = x², y = 3x² + 4, y = x³

**C/12**Understand and apply Pythagoras’ theorem when solving problems in 2D

**C/13**Calculate lengths, areas and volumes in plane shapes and right prisms

**C/14**Enlarge 2D, given a centre of enlargement and a fractional scale factor, on paper and using ICT; recognise the similarity of the resulting shapes

**C/15**Find the locus of a point that moves according to a given rule, both by reasoning and using ICT

**C/16**Recognise that measurements given to the nearest whole unit may be accurate by up to one-half of the unit in either direction

**C/17**Understand and use measures of speed (and other compound measures such as density or pressure) to solve problems

- http://www.khanacademy.org/math/arithmetic/rates-and-ratios/e/rate_problems_0.5
- http://www.khanacademy.org/math/arithmetic/rates-and-ratios/e/rate_problems_1
- http://www.khanacademy.org/math/arithmetic/rates-and-ratios/e/rate_problems_2

**C/18**Suggest a problem to explore using statistical methods, frame questions and raise conjectures; identify possible sources of bias and plan how to minimise it

**C/19**Select, construct and modify, on paper/using ICT suitable graphical representation to progress an enquiry including frequency polygons and lines of best fit on scatter graphs

**C/20**Estimate the mean, median and range of a set of grouped data and determine the modal class, selecting the statistic most appropriate to the line of enquiry

**C/21**Compare two or more distributions and make inferences, using the shape of the distributions and measures of average and range

**C/22**Understand relative frequency as an estimate of probability and use this to compare outcomes of an experiment

**C/23**Examine critically the results of a statistical enquiry, and justify the choice of statistical representation in written presentation