Grade 4 - Number
Standard 4.N.5 - Understand the relationship between multiplication and division to solve the equation.
Included Skills: Multiplication
Describe and apply mental mathematics strategies to determine basic multiplication facts to 9 × 9 and related division facts. • Provide examples for applying mental mathematics strategies: - skip counting from a known fact; e.g., for 3 × 6, think 3 × 5 = 15 plus 3 = 18. - doubling; e.g., for 4 × 3, think 2 × 3 = 6 and 4 × 3 = 6 + 6. - doubling and adding one more group; e.g., for 3 × 7, think 2 × 7 = 14 and 14 + 7 = 21. - patterns when multiplying by 9; e.g., for 9 × 6, think 10 × 6 = 60, and 60 – 6 = 54; for 7 × 9, think 7 × 10 = 70, and 70 – 7 = 63. - halving; e.g., if 4 × 6 is equal to 24, then 2 × 6 is equal to 12. - relating division to multiplication; e.g., for 64 ÷ 8, think 8 × ? = 64. - repeated doubling; e.g., for 4 × 6, think 2 × 6 = 12 and 2 × 12 = 24. • Demonstrate understanding and application of strategies for multiplication and related division facts to 9 × 9. • Demonstrate recall/memorization of multiplication and related division facts to 7 × 7.