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: