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Name LESSON 43 1 Multiply with Regrouping 4.4.D OBJECTIVE Use regrouping to multiply 2-digit numbers. Estimate. Then use regrouping to find 28 × 43. 30 × 40 = 1,200 Step 1 Round to estimate the product. Step 2 Think: 28 = 2 tens 8 ones. Multiply 43 by 8 ones. 8 × 3 = 24. Record the 4. Write the regrouped 2 above the tens place. 8 × 40 = 320. Add the regrouped tens: 320 + 20 = 340. 2 43 × 28 _ 344 Step 3 Multiply 43 by 2 tens. 20 × 3 = 60 and 20 × 40 = 800. Record 860 below 344. Step 4 Add the partial products. 8 × 43 2 43 × 28 _ 344 +860 _ 1,204 20 × 43 344 + 860 So, 28 × 43 = 1,204 . 1,204 is close to 1,200. The answer is reasonable. © Houghton Mifflin Harcourt Publishing Company Estimate. Then find the product. 1. Estimate: 36 × 12 _ Number and Operations 2. Estimate: 43 × 29 _ 3. Estimate: 51 × 47 _ 85 Name 1 Multiply with Regrouping 4.4.D Estimate. Then find the product. 1. Estimate: 2,700 2 1 Think: 32 is close to 30 and 87 is close to 90. 30 × 90 = 2,700 87 × 32 _ 174 + 2,610 __ 2,784 73 × 28 _ 5. Estimate: 84 × 40 _ 3. Estimate: 48 × 38 _ 6. Estimate: 83 × 77 _ 4. Estimate: 59 × 52 _ 7. Estimate: 91 × 19 _ Problem Solving 8. Baseballs come in cartons of 84 baseballs. A team orders 18 cartons of baseballs. How many baseballs does the team order? 86 9. There are 16 tables in the school lunch room. Each table can seat 22 students. How many students can be seated at lunch at one time? Lesson 43 © Houghton Mifflin Harcourt Publishing Company 2. Estimate: