Unit 3, Lesson 19# Multiply by multiples of 10 using the place value chart

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In this lesson, students use the place value chart to multiply by multiples of 10. To solve 2 × 40, for example, they begin by modeling 2 × 4 in the ones place. Then they relate this to multiplying 2 × 40 (or 2 × 4 tens), where the same basic fact is located in the tens column. They conclude that when multiplied by 10, the digits in the product shift one place value to the left.