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  • A2.2: Rearranging formulas – Brackets and fractions

    Learn how to manipulate or rearrange formulas that involve fractions and brackets. Formulas are used in many branches of economics, science and engineering. For example, the formula for simple interest is:1 Note that when we write \(nr\) we mean \(n\times r\). Most of the time we ignore the multiplication sign...

  • Fractions

    How do we use fractions? A fraction is the easiest way to express a part of a whole. On this page you will learn how to simplify, add, subtract, multiply and divide fractions. If you received 18/20 for your test, you got 18 marks correct out of the 20 marks...

  • Percentages and surds

    How can you turn a raw score in a test into a percentage? If you get 15/20 for a test, you have done as well as someone who got 75 out of 100! This page is full of information about percentages and surds. Percentages Percentages are another way to express...