Number and Algebra

The Number and Algebra unit

Please find links to key chapters from this area of the course below. In addition, here is a growing collection of practice questions for you to use as a reviw exercise for the whole unit. Currently there are 5 exam style questions worth 38 marks and should be completed in about 40 minutes, before looking at the solutions.


  • 1.7 Amortization and Annuities

    Many big financial decisions that you will have to make in your life will require taking out a loan, saving, or borrowing. Having a good understanding of amortization and annuities will help you to be sure you are making the best financial...

  • Accuracy and percentage error

    This section gives you a little background about what this topic is about. Video explains This section goes through all of the things that you need to know about and how to do Video - Rounding to significant figures Diagram - Significant figures

  • Sets of Numbers

    This sub topic is about the 4 key sets of numbers that define our number system. Natural numbers, Integers, Rational numbers and Real numbers. This section starts by taking you through the concept of number sets, starting with sets that we...

  • Arithmetic Sequences

    These are sequences where the difference from one term to the next remains constant, like the one in the title! Arithmetic sequences crop up in all sorts of places and this unit looks at understanding how to generalise, sum and solve problems...

  • Geometric Sequences

    These are sequences where you go from term to term by multiplying by a common ratio. the one in the title has a common ratio of 3 because each term is 3 times bigger than the previous one. Geometric sequences grow exponentially and should be...