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Multiplication and Area
Module 4: Lesson 14
Objective: Find areas by decomposing into
rectangles or completing composite figures to form
rectangles.
Group Counting (3 minutes)
Direct students to count forward and backward,
occasionally changing the direction of the count.
โ€ข Fours to 40
โ€ข Sixes to 60
โ€ข Sevens to 70
โ€ข Nines to 90
Multiply by 8
(7 Minutes)
โ€ข Write 6 ร— 8 = .) Letโ€™s skip-count up by eights to
solve. (Count with fingers to 6 as students count.)
โ€ข Letโ€™s skip-count down to find the answer, too. Start at
80. (Count down with fingers as students count.)
โ€ข Letโ€™s skip-count up again to find the answer, but this
time start at 40. (Count up with fingers as students
count.)
โ€ข Continue with the following possible sequence: 8 ร— 8,
7 ร— 8, and 9 ร— 8.
โ€ข Distribute Multiply by 8 pattern sheet.
Find the Area
(5 minutes)
On your boards, write a number
sentence to show the area of the
shaded rectangle.
โ€ข Write a number sentence to show the area of the
unshaded rectangle.
โ€ข (Write __ sq units + __ sq units = __ sq units.) Using
the areas of the shaded and unshaded rectangle,
write an addition sentence to show the area of the
entire figure.
Find the Area
โ€ข Continue with the other figures.
Application Problem
(5 minutes)
โ€ข Break apart the shaded figure into 2 rectangles. Then
add to find the area of the shaded figure below.
โ€ข Subtract the area of the unshaded rectangle from the
area of the large rectangle to check your answer in
Part (a).
Application Problem
Concept Development
(30 minutes)
Problem 1: Choose an appropriate method for
finding the area of a composite shape.
โ€ข What two strategies did we learn yesterday to find
the area of a non-rectangular shape?
Concept Development
(30 minutes)
โ€ข Look at the figure in Problem 1(a). What is the
unknown width?
โ€ข Label that on your figure. Then write the equation
used to find the area of each of the smaller
rectangles.
โ€ข What is the area of the top rectangle? What is the
area of the bottom rectangle?
โ€ข On your Problem Set, write the number sentence
used to find the area of the whole figure. Be sure to
answer in a complete sentence! What is the total area
of the figure?
โ€ข Continue with Problem 1 (b) from the Problem Set
Problem 2: Solve a word problem involving
area of non- rectangular shapes.
Fanny has a piece of fabric 8 feet long and 5 feet wide.
She cuts out a rectangular piece that measures 3 feet by
2 feet. How many square feet of fabric does Fanny have
left?
โ€ข Draw and label Fannyโ€™s fabric. How big is the piece
that Fanny cuts out?
โ€ข Work with your partner to draw the piece of fabric
that Fanny cuts out. Label the measurements of the
piece being cut out.
โ€ข Whatโ€™s the best way for us to find the area of the
remaining fabric?
โ€ข Write an equation to find the area of the original
piece of fabric.
โ€ข Beneath what you just wrote, write a number
sentence to find the area of the piece of fabric Fanny
cuts out.
โ€ข What is the area of the piece that is cut out?
โ€ข What expression tells us the area of the remaining
fabric?
โ€ข 40 โ€“ 6 equals?
โ€ข How much fabric does Fanny have left?
Problem Set (10 minutes)
You have 10 minutes to complete the problem set pages.
Debrief (10 minutes)
Letโ€™s review your solutions for the problem set.
Exit Ticket
(3 minutes)
This is where you are going to show
us that you understand what we learned today!
We will learn if you are ready for the next lesson!
Homework
Lesson 14
Homework
Worksheet
Is Due Tomorrow!

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Module 4 Lesson 14

  • 1. Multiplication and Area Module 4: Lesson 14 Objective: Find areas by decomposing into rectangles or completing composite figures to form rectangles.
  • 2. Group Counting (3 minutes) Direct students to count forward and backward, occasionally changing the direction of the count. โ€ข Fours to 40 โ€ข Sixes to 60 โ€ข Sevens to 70 โ€ข Nines to 90
  • 3. Multiply by 8 (7 Minutes) โ€ข Write 6 ร— 8 = .) Letโ€™s skip-count up by eights to solve. (Count with fingers to 6 as students count.) โ€ข Letโ€™s skip-count down to find the answer, too. Start at 80. (Count down with fingers as students count.) โ€ข Letโ€™s skip-count up again to find the answer, but this time start at 40. (Count up with fingers as students count.) โ€ข Continue with the following possible sequence: 8 ร— 8, 7 ร— 8, and 9 ร— 8. โ€ข Distribute Multiply by 8 pattern sheet.
  • 4. Find the Area (5 minutes) On your boards, write a number sentence to show the area of the shaded rectangle. โ€ข Write a number sentence to show the area of the unshaded rectangle. โ€ข (Write __ sq units + __ sq units = __ sq units.) Using the areas of the shaded and unshaded rectangle, write an addition sentence to show the area of the entire figure.
  • 5. Find the Area โ€ข Continue with the other figures.
  • 6. Application Problem (5 minutes) โ€ข Break apart the shaded figure into 2 rectangles. Then add to find the area of the shaded figure below. โ€ข Subtract the area of the unshaded rectangle from the area of the large rectangle to check your answer in Part (a).
  • 8. Concept Development (30 minutes) Problem 1: Choose an appropriate method for finding the area of a composite shape. โ€ข What two strategies did we learn yesterday to find the area of a non-rectangular shape?
  • 9. Concept Development (30 minutes) โ€ข Look at the figure in Problem 1(a). What is the unknown width? โ€ข Label that on your figure. Then write the equation used to find the area of each of the smaller rectangles. โ€ข What is the area of the top rectangle? What is the area of the bottom rectangle? โ€ข On your Problem Set, write the number sentence used to find the area of the whole figure. Be sure to answer in a complete sentence! What is the total area of the figure? โ€ข Continue with Problem 1 (b) from the Problem Set
  • 10. Problem 2: Solve a word problem involving area of non- rectangular shapes. Fanny has a piece of fabric 8 feet long and 5 feet wide. She cuts out a rectangular piece that measures 3 feet by 2 feet. How many square feet of fabric does Fanny have left? โ€ข Draw and label Fannyโ€™s fabric. How big is the piece that Fanny cuts out? โ€ข Work with your partner to draw the piece of fabric that Fanny cuts out. Label the measurements of the piece being cut out. โ€ข Whatโ€™s the best way for us to find the area of the remaining fabric?
  • 11. โ€ข Write an equation to find the area of the original piece of fabric. โ€ข Beneath what you just wrote, write a number sentence to find the area of the piece of fabric Fanny cuts out. โ€ข What is the area of the piece that is cut out? โ€ข What expression tells us the area of the remaining fabric? โ€ข 40 โ€“ 6 equals? โ€ข How much fabric does Fanny have left?
  • 12. Problem Set (10 minutes) You have 10 minutes to complete the problem set pages. Debrief (10 minutes) Letโ€™s review your solutions for the problem set.
  • 13. Exit Ticket (3 minutes) This is where you are going to show us that you understand what we learned today! We will learn if you are ready for the next lesson!