BIG IDEA
Understand the idea before memorising a rule.
Algebraic expressions is part of algebra. 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 algebra question at this grade level.
YOU WILL LEARN TO
- Explain the key ideas in algebraic expressions using accurate mathematics vocabulary.
- Apply a reliable method to a new algebraic expressions 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 an end-of-topic review for Grade 7, solve x + 10 = 25.
Model response
The correct answer is 15. Subtract 10 from both sides, so x = 15.
KNOWLEDGE CHECK