5 lessons covering
Direct Proportion Graphs
Inverse Proportion Graphs
Gradients and Rates of Change
Gradients and Instantaneous Change
Gradients and Average Change
Understand the difference between average and instantaneous change and the difference between using chords and tangents for measuring rates of change, and choose as appropriate.
Recognise and use the graph of a direct proportion relationship.
Review of straight line graphs. Link with directly proportional graphs and +ve x-axis. Worked examples and questions
5 lessons covering the Algebraic Proportion Unit:
Proportional Relationships
The Constant of Proportionality
Using Directly Proportional Relationships
Using Inversely Proportional Relationships
Practical problems with Proportional Relationships
Understand and write proportions as fractions and as algebraic relationships. Compare ratios and fractions. Express one variable in terms of another when represented as a ratio.
How to use fractions to explain proportional relationships. How to calculate complicated proportional relationships, without a calculator, using fractions.