Decomposing Arrays for Multiplication

The video lesson for third graders covers Lesson 5.11, focusing on decomposing arrays to solve multiplication problems. The teacher introduces a marching band scenario to explain how to break apart arrays into smaller arrays, using a 7x6 array as an example. Students are guided to use grids to visualize the problem and explore different ways to split the array. The lesson also includes a problem about partitioning a rectangular garden into sections, reinforcing the concept of decomposing multiplication facts. The objective is to help students understand how to decompose factors to solve multiplication problems within 100.

What is the main topic of the lesson introduced at the beginning?

• High school sports

• Music theory

• Marching bands and arrays

• Football strategies

What is the first problem about in the lesson?

• A school play

• A music concert

• A marching band forming an array

• A football game

How many rows and marchers are in the initial array?

• 5 rows and 7 marchers

• 6 rows and 7 marchers

• 7 rows and 6 marchers

• 8 rows and 5 marchers

What is one way to split the 7x6 array?

• 3x6 and 4x6

• 4x6 and 3x6

• 2x6 and 5x6

• 1x6 and 6x6

What is another way to split the 7x6 array?

• 3x6 and 4x6

• 5x6 and 2x6

• 4x6 and 3x6

• 6x6 and 1x6

Why is decomposing arrays useful for multiplication?

• It is not useful at all

• It is only useful for addition

• It helps solve unknown multiplication facts

• It makes the problem harder

What is the new problem introduced after the marching band?

• A music concert

• A football game

• A school play

• A rectangular garden

How can the garden be partitioned?

• Into three sections

• Into two rectangular sections

• Into four sections

• Into one large section

What is the objective of the lesson?

• To play sports

• To learn about music

• To write a story

• To decompose factors to solve multiplication facts