Tag Archive for: expressions

For the Eleven Plus and CEM exams, pupils need to be able to

  • Substitute numbers into formulae and evaluate the formula.
    • Example 1: Work out the value of 3a – 2b + 4c if a = 5, b = 3 and c = 2
    • Example 2: C = 5 x (F – 32) ÷ 9. What is C when F is (a) 50 and (b) 5?
  • Simplify algebraic expressions (collect like terms).
    • The angles of a triangle are a, 2a and 2a + 30. Work out the value of a.
  • Solve equations with the unknown on one side.
    • What is n if 6n – 5 = 37?
  • Solve equations with the unknown on both sides (accompanying video)
    • Work out the value of x if 5x + 7 = 25 – x
  • Solve equations with 2 or more variables.
    • There are 13 animals in the barn. Some are chickens and some are pigs. There are 40 legs in all. How many of each animal are there?
  • Form algebraic expressions and equations (accompanying video)
    • The newsagent charges x pence for a biro and y pence for a pencil. Write down an expression using x and y for the cost of three biros and two pencils.

 

Forming expressions and equations Video!

 

Solve equations with the unknown on both sides of the equal sign Video!