Mathematics
Multiplication & Division
Conceptual
8–9 yrs
Factor Pairs & Commutativity
因数对与交换律
Description
Recognise and use factor pairs and commutativity in mental calculations
Mastery Evidence
- List all factor pairs of a given number (e.g. 24: 1×24, 2×12, 3×8, 4×6)
- Use commutativity to reorder a multiplication for easier mental calculation
- Explain what a factor pair is and how commutativity helps
Assessment Prompt
If your child needs to multiply '4 × 15', can they spot that splitting it into '4 × 5 × 3 = 20 × 3 = 60' is a clever shortcut — using factor pairs to make it easier?
