Grade 5 - Number
Standard 5.N.3 - Practice division word problems with divisors up to 100.
Included Skills: Division
Apply mental mathematics strategies and number properties in order to understand and recall basic multiplication facts (multiplication tables) to 81 and related division facts. • Describe the mental mathematics strategy used to determine a given basic fact, such as: - skip count up by one or two groups from a known fact; e.g., if 5 × 7 = 35, then 6 × 7 is equal to 35 + 7 and 7 × 7 is equal to 35 + 7 + 7. - skip count down by one or two groups from a known fact; e.g., if 8 × 8 = 64, then 7 × 8 is equal to 64 – 8 and 6 × 8 is equal to 64 – 8 – 8. - doubling; e.g., for 8 × 3 think 4 × 3 = 12, and 8 × 3 = 12 + 12. - 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. - repeated doubling; e.g., if 2 × 6 is equal to 12, then 4 × 6 is equal to 24 and 8 × 6 is equal to 48. - repeated halving; e.g., for 60 ÷ 4, think 60 ÷ 2 = 30 and 30 ÷ 2 = 15. • Explain why multiplying by zero produces a product of zero (zero property of multiplication). • Explain why division by zero is not possible or is undefined; e.g., 8 ÷ 0. • Determine, with confidence, answers to multiplication facts to 81 and related division facts. • Demonstrate understanding, recall/memorization and application of multiplication and related division facts to 9 × 9.