Mathematics
Addition & Subtraction
Conceptual
6–7 yrs
Addition in any order
加法交换律
Description
Understand and apply the commutative property of addition: addends can be added in any order
Mastery Evidence
- Explain that 3 + 8 gives the same answer as 8 + 3
- Use commutativity to choose the larger number to count on from
- Demonstrate that subtraction is not commutative (5 − 3 ≠ 3 − 5)
Assessment Prompt
Does your child know that 6 + 4 gives the same answer as 4 + 6, so they can always choose whichever order makes the adding easier?
