Exploring Multiplication Arrays in Bridges 2.1.5

The video tutorial covers multiplication arrays and area calculation through a story problem involving garden ants. Students are guided to use base 10 pieces to solve area problems for a berry patch, vegetable garden, apple orchard, and porch. The lesson emphasizes estimation and breaking down numbers into tens and ones. Instructions for workbook exercises are provided to reinforce learning.

What materials do you need for today's lesson?

• Base 10 pieces or the number pieces app

• A calculator

• Colored pencils and paper

• Scissors and glue

What is the main task in the story of the garden ants?

• To draw a picture of the garden

• To count the number of ants

• To decide how much space is needed for their favorite plants

• To find the perimeter of the garden

What is a reasonable estimate for the area of a 12 cm by 14 cm berry patch?

• Greater than 100 square centimeters

• Exactly 100 square centimeters

• Exactly 144 square centimeters

• Less than 100 square centimeters

What is the area of the berry patch that is 12 cm by 14 cm?

• 140 square centimeters

• 168 square centimeters

• 144 square centimeters

• 100 square centimeters

What are the dimensions of Mrs. Ant's vegetable garden?

• 11 cm by 13 cm

• 12 cm by 14 cm

• 13 cm by 15 cm

• 10 cm by 12 cm

What is the area of Mrs. Ant's vegetable garden?

• 168 square centimeters

• 150 square centimeters

• 130 square centimeters

• 143 square centimeters

What is the estimated area of the apple orchard?

• Less than 100 square centimeters

• Exactly 144 square centimeters

• Greater than 150 square centimeters

• Exactly 200 square centimeters

What is the area of the apple orchard that is 12 cm by 15 cm?

• 180 square centimeters

• 168 square centimeters

• 200 square centimeters

• 144 square centimeters

What is the area of the porch that is 11 cm by 21 cm?

• 200 square centimeters

• 210 square centimeters

• 220 square centimeters

• 231 square centimeters

What is the final step after building each array?

• Counting the number of pieces

• Writing an expression or equation to show the product

• Drawing a picture of the array

• Estimating the area again