Overview
The lecture introduces basic addition and subtraction fact families, emphasizing the relationships between these math facts.
Fact Families Explained
- A fact family groups related addition and subtraction facts using the same numbers.
- Example: If 4 + 5 = 9 and 5 + 4 = 9, then 9 - 4 = 5 and 9 - 5 = 4.
- Each fact family shows how addition and subtraction are connected.
- Similarly, if 4 + 6 = 10 and 6 + 4 = 10, then 10 - 4 = 6 and 10 - 6 = 4.
- Fact families help reinforce understanding of basic math operations.
- Recognizing these relationships improves speed and accuracy with basic math facts.
Key Terms & Definitions
- Fact Family — A group of related addition and subtraction facts using the same three numbers.
Action Items / Next Steps
- Practice creating additional fact families using different numbers.
- Review and memorize common fact families for quick recall.