Mathematics
Addition & Subtraction
Conceptual
6–7 yrs
Grouping numbers to add
凑数相加
Description
Understand and apply the associative property of addition: when adding three numbers, any two can be added first
Mastery Evidence
- Solve 2 + 6 + 4 by first adding 6 + 4 = 10, then 2 + 10 = 12
- Explain that grouping addends differently gives the same total
- Choose which two numbers to add first to make the calculation easier
Assessment Prompt
If your child needs to add 3 + 7 + 6, can they spot that adding 3 and 7 first (to make 10) is easier — rather than always working left to right?
