Understanding Arrays and Multiplication

This lesson teaches how to solve multiplication problems using arrays. It begins by explaining multiplication as repeated addition and equal groups. The lesson then demonstrates how to create arrays to represent multiplication problems, using examples like 5x3 and 6x2. A word problem involving setting up chairs for an assembly is solved using arrays, illustrating the practical application of this method. The lesson concludes by reinforcing the concept of arrays in multiplication.

How can 5 times 3 be represented using addition?

• 5 plus 5 plus 5

• 3 plus 5

• 3 plus 3 plus 3 plus 3

• 5 plus 3

What shape does an array form when representing a multiplication problem?

• Square

• Triangle

• Rectangle

• Circle

In an array, what do the rows and columns represent?

• The number of groups

• The number of dots

• The factors of the multiplication problem

• The total product

How many dots are there in total when you create an array for 6 times 2?

• 10

• 12

• 14

• 16

What is the product of 6 times 2 when represented as an array?

• 13

• 12

• 10

• 11

What is true about the two arrays you can make for any multiplication problem?

• They are different shapes

• They have different numbers of dots

• They are the same size and shape

• They are different sizes

How many rows and chairs per row did Principal Anthony set up for the assembly?

• 3 rows and 10 chairs

• 4 rows and 9 chairs

• 5 rows and 8 chairs

• 6 rows and 7 chairs

What is the total number of chairs set up by Principal Anthony?

• 36

• 32

• 30

• 34

What method did Principal Anthony use to ensure there were enough chairs?

• He asked the students

• He guessed the number

• He used a calculator

• He used an array to calculate

What is the product of 4 times 9?

• 32

• 34

• 38

• 36