This Application Problem is a part of the Lesson 38, Unit 3, Grade 4. Sandy's garden has 42 plants in each row. She has 2 rows of yellow corn and 20 rows of white corn. Draw an area model (representing two partial products) to show how much yellow corn and white corn has been planted in the garden. When multiplying two-digit by two-digit numbers, use place value cards (e.g., Hide Zero cards) to represent the factors. The cards provide a concrete representation of the place value of each digit within the factors and are another way to promote understanding of the multiplication algorithm.