1. Chapter 3

2. 1. Multiply 40 x 30 = _________ Use place value to explain how you know your answer is correct.

3. 2. Circle the best estimate for 35 x 52 a.40 x 50 = 2,000 b.30 x 50 = 1,500 c.30 x 60 = 1,800 d.40 x 60 = 2,400

4. 3. Multiply. Show your thinking 32 x 18= 300240 2016

5. 4. Multiply. Show your thinking 45 x 26=

6. 5. Laura made this model to find the product of 45 and 51. Circle the error. 200250 405

7. 6. Solve the problem correctly. 800320 120 48

8. 7. Find the unknown digits and solve the problem.

9. 8. Find the unknown digits and solve the problem.

10. 9. Mr. Wulbecker has $180 to buy 20 books for the library. If each book costs $13, how much more money does he need to buy the books?

11. 10. Joe has 26 shelves in his library. Each shelf has 13 books. He orders 32 more books. Write an equation that best estimates about how many books he will have. 30 x 10 + 30 = b 300 + 30 = b 330 =b So the equation is 30 x 10 + 30 = 330

12. 11. A college has a building with 4 floors. Each floor has 17 rooms with 35 seats in each room. Without actually solving, how do you know that building has at least 3,000 seats? 4 floors x 20 rooms = about 80 rooms 80 rooms x 40 seats = about 3,200 seats I estimated that there are about 80 rooms with about 40 seats per room. This is 3,200 seats, which is more than 3,000.

13. 12. Diego has 32 Legos. He buys 6 more packages with 15 Legos in each package. Diego gives 20 Legos to his friend Edgar. How many Legos does he have now? Step 1: How many Legos did he buy? 3 15 x 6 -------- 90 Step 2: add the Legos that he bought to the ones that he already had. 90 + 32 --------- 122 Step 3: subtract the Legos that he gave to Edgar. 122 - 20 ---------- 102 Diego has 102 Legos left

14. You will rock the chapter 3 test!!!!