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Five-Minute Check (over Lesson 3–5) Main Idea Example 1: Multiply Two-Digit Numbers Example 2: Multiply Three-Digit Numbers • I will multiply up to a three-digit number by a two-digit number. Multiply Two-Digit Numbers The fastest human runner was clocked at 11 feet per second. How far will the runner run in 55 seconds? Estimate 55 × 11 55 × 10 = 550 Step 1 Step 2 Multiply the ones. Multiply the tens. × 55 11 5555 × 1 = 55 × 55 11 5555 × 10 = 550 550 Multiply Two-Digit Numbers Step 3 Add. × + 55 11 55 55 + 550 550 = 605 605 Answer: So, the runner will run 605 feet in 55 seconds. Find 13 × 32. A. 65 B. 390 C. 410 D. 416 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D Multiply Three-Digit Numbers Find 438 × 46. Estimate 438 × 46 400 × 50 = 20,000 Step 1 Step 2 Multiply the ones. Multiply the tens. 438 438 × 46 2628 438 × 6 = 2,628 × Step 3 46 Add. × 2628 + 438 × 40 17520 = 17,520 Answer: So, 438 × 46 = 20,148. 438 46 2,628 + 2628 17,520 = 17 20,148 20 Find 723 × 21. A. 15,183 B. 15,283 C. 16,197 D. 16,225 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D End of the Lesson Five-Minute Check (over Lesson 3–5) Image Bank Math Tool Chest Multiply Mentally (over Lesson 3–5) Draw a picture to solve. Vanita has a piece of fabric that is 54 inches wide and two yards long. To make a headband, she needs 3 strips that are each 18 inches long and 3 inches wide. What is the largest number of headbands she can make from the fabric? A. 16 headbands 0% D A B C 0%D C D. 27 headbands 0% A C. 24 headbands 1. 2. 3. 4. 0% B B. 20 headbands