Unit 3, Lesson 20# Use place value strategies and the associative property n x (m x 10) = (n x m) x 10 (where n and m are less than 10) to multiply multiples of 10

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In this lesson, students continue learning strategies to multiply by multiples of 10. They use the associative property to rewrite multiplication expressions in forms that are easier to evaluate. For example, they rewrite 40 × 2 as (10 × 4) × 2, then as 10 × (4 × 2), and finally as 10 × 8.