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Lesson 4-1 Example 1 2-1 Example 1 Draw an array to model the expression 4 × 5. Then write and model the commutative fact. 1.Identify the first number in the expression. This represents the number of rows in the array. 4

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Lesson 4-1 Example 1 2-1 Example 1 Draw an array to model the expression 4 × 5. Then write and model the commutative fact. 2.Identify the second number in the expression. This represents the number of columns in the array. 5 Count the number of rectangles. The product of 4 × 5 = 20.

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Lesson 4-1 Example 1 2-1 Example 1 Draw an array to model the expression 4 × 5. Then write and model the commutative fact. 3.The commutative fact for 4 × 5 = 20 is 5 × 4 = 20. Count the number of rectangles. The product of 5 and 4 is equal to the product of 4 and 5, which is 20.

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