Mastering Multi-Digit Multiplication!

Mathematics Grades 4th Grade 3:02 Video
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Lesson Description

Learn how to multiply big numbers with this fun lesson that uses a catchy song to help you remember the steps!

Video Resource

Long Multiplication Song | Multi-Digit Multiplication

Math Songs by NUMBEROCK

Duration: 3:02
Watch on YouTube

Key Concepts

  • Multi-digit multiplication
  • Carrying over
  • Place value
  • Partial Products
  • Inverse operations

Learning Objectives

  • Students will be able to accurately multiply two-digit numbers by two-digit numbers.
  • Students will understand the concept of carrying over when multiplying.
  • Students will understand the importance of place value when performing long multiplication.
  • Students will be able to check their multiplication using inverse operations.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they already know about multiplication. Show the Numberock video 'Long Multiplication Song | Multi-Digit Multiplication'. Tell them to listen carefully for the steps of long multiplication.
  • Guided Practice (15 mins)
    Work through the examples from the song on the board (59 x 25 and 23 x 19). Emphasize each step: multiplying the ones place, carrying over, multiplying the tens place, writing the zero, and adding the partial products. Have students follow along in their notebooks.
  • Independent Practice (15 mins)
    Provide students with a worksheet containing several two-digit by two-digit multiplication problems. Circulate the room to provide assistance as needed.
  • Checking with Inverse Operations (5 mins)
    Explain to students how to use division to check their work. Demonstrate how the product becomes the dividend, and the original multiplier is the divisor. The quotient should equal the original multiplicand.
  • Decimal Point Review (5 mins)
    Reiterate the step of counting decimal places after learning long multiplication to ensure comprehension of the whole video.

Interactive Exercises

  • Whiteboard Practice
    Have students come to the board to solve multiplication problems, explaining their steps to the class.
  • Multiplication Relay Race
    Divide the class into teams and have them race to solve multiplication problems correctly.

Discussion Questions

  • Why is it important to write a zero when we multiply the tens?
  • What happens if you forget to carry over?
  • How can we check if our answer is correct?
  • How does multiplication help us in everyday life?

Skills Developed

  • Multiplication fluency
  • Problem-solving
  • Critical thinking
  • Application of mathematical concepts

Multiple Choice Questions

Question 1:

What do you do after multiplying the ones place in long multiplication?

Correct Answer: Carry over if needed

Question 2:

What number do you write down when multiplying the tens place in long multiplication?

Correct Answer: Zero

Question 3:

In the problem 23 x 19, what is the product?

Correct Answer: 437

Question 4:

What is the inverse operation of multiplication?

Correct Answer: Division

Question 5:

What do we call the answer to a multiplication problem?

Correct Answer: Product

Question 6:

In the multiplication problem, 59 x 25, what two numbers will we be adding together in the final step?

Correct Answer: 295 and 1180

Question 7:

When a number is carried over, what operation do you perform?

Correct Answer: Addition

Question 8:

If a problem involves multiplying decimals, what is the last step?

Correct Answer: Count the decimal places

Question 9:

When multiplying the tens place, we are multiplying by what multiple of ten?

Correct Answer: 10

Question 10:

What is the other name for a multiplication problem?

Correct Answer: Factor

Fill in the Blank Questions

Question 1:

When we multiply the tens, we need to write a ____ .

Correct Answer: zero

Question 2:

Five times nine is forty-five; ____ the four and write the five.

Correct Answer: carry

Question 3:

Add the numbers up, and that is the ____ .

Correct Answer: product

Question 4:

The product becomes the ____ when checking long multiplication.

Correct Answer: dividend

Question 5:

The ____ is the multiplier or multiplicand.

Correct Answer: divisor

Question 6:

The answer to 59 x 25 is ____ .

Correct Answer: 1475

Question 7:

In long multiplication, understanding ____ ____ is essential to solving the problem.

Correct Answer: place value

Question 8:

We do long ____ if the quotient is the other factor, then we know we’ve got the right answer.

Correct Answer: division

Question 9:

If the numbers contain ____, the extra work is minimal.

Correct Answer: decimals

Question 10:

We move left in the product that many ____, that’s where the decimal point’s written

Correct Answer: spaces

Educational Standards

4.N.2.2:Multiply 3-digit by 1-digit and 2-digit by 2-digit whole numbers, using various strategies, including but not limited to standard algorithms. 4.N.2.3:Estimate products of 3-digit by 1-digit and 2-digit by 2-digit whole number factors using a variety of strategies (e.g., rounding, front end estimation, adjusting, compatible numbers) to assess the reasonableness of results. Explore larger numbers using technology to investigate patterns.

Teaching Materials

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