We have four important symbols relating to inequalities, and we need to know what each of them mean: <, ≤, > and ≥.

We also need to be able to read an inequality from a number line and write a given inequality on a number line, and recognise the difference between a **closed** circle and an **open** circle.

We should be able to rewrite sentences such as “John’s age is greater than 34” and “John’s age is greater than twice Susan’s age” using inequalities.

**Exercise**

Let’s complete exercise 16 on pages 93 and 94 of the core textbook:

The answers are below: