Grade 4 - Number
Standard 4.N.3 - Practice multiplying by 10.
Included Skills: Multiplication
Demonstrate an understanding of multiplication of whole numbers (limited to numbers less than or equal to 10) by: applying mental mathematics strategies, explaining the results of multiplying by 0 and 1 • Explain the strategy used to determine a product. • Explain the strategy used in a given solution to a product. For example: - for 4 x 3, thinking 2 x 3 = 6 and 4 x 3 = 6 + 6 or 6 + 2 = 12 (halving and doubling) - for 3 x 7 think 2 x 7 = 14 and 14 + 7 = 21 (doubling and adding one more group) - for 9 x 6, think 10 x 6 = 60 and 60 - 6 = 54 (multiplying by ten and subtracting one group) - knowing 2 x 6 = 12, then 4 x 6 = 12 x 2 = 24 (doubling) - for 64 ÷ 8, think 8 x ? = 64 (relating division to multiplication) - for 8 x 5, knowing that 5 x 5 = 25, and then skip counting by 5 three times to get 25 + 5 + 5 + 5 = 40. • Explain the property for determining the answer when multiplying numbers by one. • Explain the property for determining the answer when multiplying numbers by zero.