Final answer:
To check Zach's work with multiplication, we can use partial products to complete the model. The products for the four smaller rectangles are: a = 100, b = 0.8, c = 4, and d = 0.8.
Step-by-step explanation:
To check Zach's work with multiplication, we can use partial products to complete the model. The large rectangle is divided into four smaller rectangles, with the top line labeled 5 and 0.2, and the left side labeled 20 and 4. We need to find the products for the four smaller rectangles: a, b, c, and d.
- Product for a = 20 * 5 = 100
- Product for b = 4 * 0.2 = 0.8
- Product for c = 20 * 0.2 = 4
- Product for d = 4 * 0.2 = 0.8