This Problem Set is a part of the Lesson 6, Unit 3, Grade 4. In this lesson, students build on prior lessons by continuing to use the place value chart to multiply by multiples of 10, but now both factors are two-digit multiples of 10. This lesson also brings back the area model, which students use in addition to the place value chart to represent and multiply a two-digit multiple of 10 by a two-digit multiple of 10.