Partitioning Rectangles and Arrays

The video tutorial introduces second graders to the concept of arrays, focusing on rows and columns. It explains how to identify rows and columns in different shapes like moons, smiley faces, and triangles. The teacher demonstrates how to use arrays for repeated addition, showing that the sum remains the same whether adding rows or columns. The lesson progresses to partitioning rectangles into equal parts using inches and centimeters, reinforcing the concept of arrays and repeated addition. The tutorial concludes with practical exercises from the workbook, emphasizing the importance of understanding arrays in math.

What is an array?

• A collection of objects arranged in rows and columns

• A random assortment of shapes

• A type of triangle

• A single line of numbers

How do rows in an array run?

• Top to bottom

• In a circle

• Diagonal

• Side to side

In the example with moons, how many rows are there?

• Three

• Four

• One

• Two

How many smiley faces are in each row?

• Five

• Three

• Two

• Four

What is the total number of triangles in the rows?

• 18

• 12

• 15

• 10

How do columns in an array run?

• Side to side

• Top to bottom

• In a circle

• Diagonal

In the example with moons, how many columns are there?

• Seven

• Six

• Five

• Four

How many smiley faces are in each column?

• Five

• Four

• Three

• Two

What is the total number of triangles in the columns?

• 10

• 18

• 12

• 15

What is the result of adding the rows of moons?

• 14

• 10

• 16

• 12