BIG IDEA
Understand the idea before memorising a rule.
Ratios, rates and percentages is part of statistics. At Grade 7, the goal is to connect this topic to a clear method, relevant evidence and a final check. You will apply that idea to a real statistics question at this grade level.
YOU WILL LEARN TO
- Explain the key ideas in ratios, rates and percentages using accurate mathematics vocabulary.
- Apply a reliable method to a new ratios, rates and percentages task.
- Check the result and explain why the evidence supports it.
METHOD
A reliable three-step approach
- 1
Identify the information and the unknown.
- 2
Choose a rule or operation and show every step.
- 3
Check the result with estimation, substitution or units.
WORKED EXAMPLE
During a revision card for Grade 7, find the mean of 9, 11, 13, 15.
Model response
The correct answer is 12. The total is 48. Divide by 4 to get 12.
KNOWLEDGE CHECK