1.1 Introduction and key concepts (EMG2)

Numbers occur all around us in many formats and contexts. For example, your house has a number, you may have a phone number and there are numbers on the till slips you get at the shops. It is important to understand when and how different kinds of numbers are used and to become confident in doing calculations and operations using numbers, in order to understand and navigate your way through everyday situations from cooking to banking!

In this chapter we will learn about:

• number formats and conventions.
• operations using numbers and calculator skills.
• rounding.
• ratios and proportion.
• rates.
• percentages.