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Learn how to multiply two-digit and three-digit numbers efficiently and accurately. Practice estimating and multiplying to enhance your math skills. Improve your mental math abilities with helpful examples and exercises.
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Five-Minute Check (over Lesson 3–3) Main Idea Example 1: Two-Digit and Three-Digit Numbers Example 2: Two-Digit and Three-Digit Numbers Lesson Menu
I will multiply up to a three-digit number by a one-digit number. Main Idea/Vocabulary
Estimate48 × 6 50 × 6 = 300 4 48 6 × 8 Two-Digit and Three-Digit Numbers Find 48 × 6. Step 1 Multiply the ones. Step 2 Multiply the tens. 4 48 6 × 8 28 6 × 8 = 48 ones 6 × 4 = 24 tens 24 + 4 = 28 tens Answer: So, 48 × 6 = 288. Example 1
A B C D Find 73 × 5. • 350 • 362 • 365 • 735 Example 1
Estimate450 × 8 450 × 10 = 4,500 Two-Digit and Three-Digit Numbers A theater can seat 450 people for each show. If the theater fills for 8 shows, how many people attend in all? Step 1 Multiply the ones. Regroup if necessary. 450 × 8 0 8 × 0 = 0 ones Example 2
450 450 × × 8 8 00 0 Two-Digit and Three-Digit Numbers Step 2 Multiply the tens. Add any new tens. Regroup if necessary. 4 0 8 × 5 = 40 tens Step 3 Multiply the hundreds. Add any new hundreds. Regroup if necessary. 4 8 × 4 = 32 hundreds 36 32 + 4 = 36 hundreds Answer: So, 3,600 people can attend 8 shows. Example 2
A B C D An auditorium seats 625 people for each show. If the auditorium fills for 7 shows, how many people attend in all? • 4,125 people • 4,375 people • 4,750 people • 5,150 people Example 2
End of the Lesson End Lesson
Five-Minute Check (over Lesson 3–3) Image Bank Math Tool Chest Multiply Mentally Resources
A B C D (over Lesson 3–3) Estimate 52 × 78 by rounding or by compatible numbers. Show your work. • 3,500; 50 × 70 = 3,500 • 4,000; 50 × 80 = 4,000 • 3,200; 50 × 80 = 3,200 • 4,500; 55 × 70 = 4,500 Five Minute Check 1
A B C D (over Lesson 3–3) Estimate 288 × 6 by rounding or by compatible numbers. Show your work. • 1,800; 300 × 6 = 1,800 • 1,500; 250 × 6 = 1,500 • 2,400; 300 × 6 = 2,400 • 2,600; 300 × 6 = 2,600 Five Minute Check 2
A B C D (over Lesson 3–3) Estimate 522 × 29 by rounding or by compatible numbers. Show your work. • 15,000; 500 × 30 = 15,000 • 16,500; 550 × 30 = 16,500 • 10,000; 500 × 20 = 10,000 • 20,000; 500 × 30 = 20,000 Five Minute Check 3
A B C D (over Lesson 3–3) Estimate 17 × 592 by rounding or by compatible numbers. Show your work. • 18,000; 20 × 600 = 18,000 • 16,000; 20 × 600 = 16,000 • 12,000; 20 × 600 = 12,000 • 9,000; 15 × 600 = 9,000 Five Minute Check 4
A B C D (over Lesson 3–3) Estimate 253 × 23 by rounding or by compatible numbers. Show your work. • 6,250; 250 × 25 = 6,250 • 500; 250 × 2 = 500 • 6,000; 300 × 20 = 6,000 • 5,000; 250 × 20 = 5,000 Five Minute Check 5