Cupcakes and Calculations: Mastering Long Multiplication!

Mathematics Grades 4th Grade 21:01 Video
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Lesson Description

Learn long multiplication with Clancy and his cupcake obsession! This lesson breaks down double-digit multiplication, including regrouping and using a placeholder zero, in a fun and easy way.

Video Resource

Long Multiplication for Kids | Homeschool Pop

Homeschool Pop

Duration: 21:01
Watch on YouTube

Key Concepts

  • Multiplication as repeated addition
  • Place value (ones, tens, hundreds)
  • Regrouping (carrying over)
  • Placeholder zero in long multiplication
  • Product as the answer to a multiplication problem

Learning Objectives

  • Students will be able to multiply double-digit numbers by single-digit numbers with and without regrouping.
  • Students will be able to multiply double-digit numbers by double-digit numbers using long multiplication, including the placeholder zero.
  • Students will understand and apply the concept of regrouping in multiplication.
  • Students will define the word 'product' and explain what it means in multiplication.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing basic multiplication concepts using the cupcake examples from the video (6 x 2, 9 x 1, 3 x 5). Define the word 'product'.
  • Double-Digit × Single-Digit Multiplication (15 mins)
    Watch the section of the video (2:55-7:17) demonstrating double-digit times single-digit multiplication (12 x 4, 21 x 3, 42 x 2). Practice a few similar problems as a class, emphasizing lining up place values. Address any questions the students might have.
  • Regrouping (10 mins)
    Watch the section of the video (7:17-10:09) explaining regrouping (57 x 2, 47 x 3). Work through additional regrouping problems together, step-by-step. Have students explain the process in their own words.
  • Double-Digit × Double-Digit Multiplication (20 mins)
    Watch the section of the video (10:09-19:45) covering double-digit times double-digit multiplication (21 x 11, 62 x 20, 34 x 13). Emphasize the importance of the placeholder zero. Practice problems together, and then have students work independently or in pairs. Reinforce the steps: cover the digit, placeholder zero, add them together.
  • Review and Wrap-up (10 mins)
    Review all the steps of long multiplication. Answer any final questions. Briefly discuss how these skills apply to real-world problems. Recap the definition of 'product'.

Interactive Exercises

  • Cupcake Calculation Challenge
    Present word problems involving cupcakes that require long multiplication to solve. For example: 'Clancy buys 23 boxes of cupcakes, and each box contains 14 cupcakes. How many cupcakes does Clancy buy in total?'
  • Place Value Power-Up
    Write numbers on the board and have students identify the value of each digit (e.g., In the number 34, the 3 is in the tens place, so it represents 30).

Discussion Questions

  • Why is it important to line up the numbers correctly according to place value when multiplying?
  • What does it mean to 'regroup' in multiplication, and why do we do it?
  • Why do we use a placeholder zero when multiplying double-digit numbers by double-digit numbers?
  • What is the product in a multiplication problem, and where do we find it?

Skills Developed

  • Multiplication
  • Problem-solving
  • Critical thinking
  • Attention to detail
  • Place value understanding

Multiple Choice Questions

Question 1:

What is the answer to a multiplication problem called?

Correct Answer: Product

Question 2:

What do you do if the answer to multiplying the ones place is a two-digit number?

Correct Answer: Only write the ones digit and regroup the tens digit.

Question 3:

In the problem 24 x 12, what is the first step?

Correct Answer: Multiply 2 x 4

Question 4:

In long multiplication, what number do we put down as a placeholder?

Correct Answer: 0

Question 5:

What does it mean to 'regroup' in multiplication?

Correct Answer: To carry over a digit to the next place value.

Question 6:

What is 12 x 0?

Correct Answer: 0

Question 7:

What is the product of 11 x 11?

Correct Answer: 121

Question 8:

Clancy bought 4 boxes of cupcakes, with 6 cupcakes in each box. How many cupcakes did he buy?

Correct Answer: 24

Question 9:

Which place value is the farthest to the right?

Correct Answer: Ones Place

Question 10:

What two numbers do we add together after using the placeholder 0?

Correct Answer: Both multiplication problems.

Fill in the Blank Questions

Question 1:

The answer to a multiplication problem is called the ________.

Correct Answer: product

Question 2:

When we carry a number in multiplication, it's called ________.

Correct Answer: regrouping

Question 3:

When multiplying double-digit numbers, we use a __________ zero as a placeholder.

Correct Answer: zero

Question 4:

In the number 45, the 4 represents 4 ________.

Correct Answer: tens

Question 5:

When we perform long multiplication, we always start with the __________ place.

Correct Answer: ones

Question 6:

Any number times __________ equals zero.

Correct Answer: 0

Question 7:

The number behind the owl is in the __________ place.

Correct Answer: tens

Question 8:

When multiplying 34 x 13, you have to add __________ together at the end to get the product.

Correct Answer: both multiplication problems

Question 9:

If Clancy bought 5 boxes of cupcakes with 2 cupcakes in each box, the product would be __________.

Correct Answer: 10

Question 10:

The __________ is one place value larger than the ones place.

Correct Answer: tens

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.2.1:Demonstrate fluency with multiplication and division facts with factors up to 12. 4.N.1.2:Use place value to describe whole numbers between 1,000 and 1,000,000 in terms of millions, hundred thousands, ten thousands, thousands, hundreds, tens, and ones with written, standard, and expanded forms.

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