Jimmy Chang explains how to use math arrays to represent multiplication expressions using columns and rows. He illustrates this with an example of 5 * 3 using triangles, showing how to count the total to understand the result. This method is useful for teaching basic multiplication to young learners.

What is the primary purpose of using math arrays?

• To divide numbers

• To express multiplication expressions

• To solve addition problems

• To subtract numbers

What is a pictorial way to use math facts?

• Using symbols

• Using numbers only

• Using arrays

• Using letters

In a math array, what does the first number represent?

• Columns

• Triangles

• Squares

• Rows

If you have a math array of 5 * 3, how many rows will there be?

• 15

• 8

• 3

• 5

What does the second number in a math array represent?

• Rows

• Numbers

• Shapes

• Columns

What shape is used in the example to represent columns and rows?

• Circles

• Stars

• Squares

• Triangles

What is another way to represent multiplication besides using triangles?

• All of the above

• Using circles

• Using humans

• Using squares

How many triangles are there in total in a 5 * 3 math array?

• 12

• 15

• 20

• 10

What does counting the total number of items in a math array help you understand?

• The quotient of division

• The difference between numbers

• The result of multiplication

• The sum of numbers

What is the result of 5 * 3 using a math array?

• 10

• 12

• 15

• 20