Curriculum placement
Grade 1. This describes the skill, not a learner estimate.
Turnaround addition facts
Use a known addition fact to know its turnaround and see that subtraction does not turn around
Problem types
- Turn a fact around
- Sum of a turned-around fact
Builds on
Leads to
- Properties of addition and multiplication · Extend the idea
A turnaround fact says the order of two addends does not change the sum. Multiplication has the same order rule: 3 × 4 and 4 × 3 make the same product.
Related skills
- Add two-digit numbers · Shared foundations
- Equations for addition and subtraction stories · Shared foundations
- Counting on and counting back · Shared foundations
- The meaning of the equal sign · Shared foundations
- Subtracting within 20 · Shared foundations
Open the interactive map to explore lessons and skill connections.