This Problem Set is a part of the Lesson 6, Unit 3, Grade 3. In this lesson, students multiply and divide units of 6 and 7 using the distributive property to break new facts into the sum of two known facts. For example, they learn to multiply 9 × 7 by finding (5 × 7) + (4 × 7). Along the way, students use tape diagrams and number bonds to represent their calculations.