Patterns & Algebra Year 7 Maths

The following interactive textbook has been designed to teach Year 7 students in accordance with the following ACARA headings:
Introduce the concept of variables as a way of representing numbers using letters (ACMNA175)
Create algebraic expressions and evaluate them by substituting a given value for each variable (ACMNA176)
Extend and apply the laws and properties of arithmetic to algebraic terms and expressions (ACMNA177)