Let's use area models to practice multiplying decimals! Each area model represents the whole and is divided into ten equal parts. To solve 4 x 0.7, start by shading 7 parts of the first area model for 0.7. Then, continue shading 7 parts three more times to complete 4 x 0.7. When you're done, you'll see that the first two area models and 8 parts of the third one are all shaded. That's your answer: 2.8. Now, use this method to solve these four problems.