Multiplying Two-Digit Numbers

Mr. Ahmed teaches lesson 3.5 on multiplying with regrouping. The lesson begins with an essential question about using regrouping to multiply two-digit numbers. Mr. Ahmed demonstrates solving a problem using estimation and then provides a detailed, step-by-step guide to multiplying 93 by 25 using regrouping. He also explores alternative methods used by students Sean and Betty to solve similar problems. The lesson concludes with practice problems to reinforce the concepts taught.

What is the main topic of lesson 3.5?

• Addition with regrouping

• Subtraction with regrouping

• Multiplication with regrouping

• Division with regrouping

What is the essential question of the lesson?

• How can you use regrouping to subtract two-digit numbers?

• How can you use regrouping to divide two-digit numbers?

• How can you use regrouping to multiply two-digit numbers?

• How can you use regrouping to add two-digit numbers?

How many minutes did it take to make one Model T Ford car?

• 93 minutes

• 100 minutes

• 80 minutes

• 120 minutes

What is the estimated product of 93 and 25 when rounded to the nearest ten?

• 3,000

• 2,000

• 2,500

• 2,700

In the first step of multiplying 93 by 25, what is the product of 3 and 25?

• 75

• 50

• 125

• 100

What is the result of multiplying 25 by 90 in the second step?

• 2,250

• 2,500

• 2,000

• 2,750

What is the final product of 93 multiplied by 25?

• 2,400

• 2,500

• 2,700

• 2,325

What method did Sean use to solve the multiplication problem?

• Regrouping

• Estimation

• Place value and mental math

• Long division

What method did Betty use to solve the multiplication problem?

• Estimation

• Long division

• Place value and mental math

• Regrouping

What is the first step in the 'Share and Show' problem involving 27 and 60?

• Multiply 60 by 27

• Multiply 60 by 0

• Multiply 0 by 27

• Multiply 27 by 60