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Multiplication and Area
Topic D: Applications of Area Using Side Lengths of
Figures
Module 4: Lesson 12
Objective: Solve word problems involving area.
Fluency Practice
(15 minutes)
Group Counting (3 min)
• Fours to 40
• Sixes to 60
• Eights to 80
• Nines to 90
Fluency Practice
(11 minutes)
Multiply by 7 (8 minutes)
7 x 7 = _______ Let’s skip count by sevens.
7, 14, 21, 28, 35, 42, 49.
Let’s see how we can skip count down to find the
answer too. Start at 70.
70, 63, 56, 49
Continue with the following sequence: 9 x 7, 6 x 7, and
8 x 7.
Fluency Practice
(11 minutes)
Multiply by 7 pattern sheet (2 min)
Let’s practice multiplying by 7. Be sure to work left to
right across the page.
Fluency Practice
(11 minutes)
Find side length (5 min)
Say the area of the rectangle.
What is the width of the rectangle?
Complete the equation: 2 units x ____ units = 10 sq units
Continue with the following possible sequence:
1 unit X ____ units = 8 square units, 5 units x ___ units = 15 sq units,
3 units x ____ units = 18 sq units, and 6 units x ____ units = 24 sq units
Application Problem (5 minutes)
• Find the area of a 6m by 9m rectangle.
• Use the side lengths 6m by 9m to find different side
lengths for a rectangle that has the same area.
Show your equation using parentheses. Then
estimate to draw the rectangle and label the side
lengths.
Application Problem (5 minutes)
Concept Development (30 minutes)
Part 1: Solve area word problems with 1 side
length unknown.
The area of Theo’s banner is 32 square feet. If the
length of his banner measures 4 feet, how wide is it?
What information is known? What is unknown?
I’ll draw an area model and use a letter for the
unknown.
Concept Development (30 minutes)
If the length is 4 feet and the
area is 32 square feet, can the
width be less than 4 feet?
No, the width needs to be more
than 4 feet. The width should be
more than 4 feet because 4 times
4 only equals 16, but the area is
32 square feet.
Concept Development (30 minutes)
Talk to your partner: Is the
area model I drew an
accurate representation of
the rectangle in the
problem? How do you
know? No, because the
width should be much
longer than the length.
Work with your partner to
correctly redraw my area
model on your board.
Concept Development (30 minutes)
How can we find the value of w?
Right! Divide 32 by 4!
What is the value of w? 8!
So what is the width of Theo’s banner?
8 feet!
Concept Development (30 minutes)
Part 2: Choose a strategy to find the area of a
larger rectangle.
Amir is getting carpet in his bedroom, which measures 7
feet by 15 feet. How many square feet of carpet will
Amir need?
Draw an area model to represent Amir’s bedroom. Write
an expression that shows how to find the area.
Concept Development (30 minutes)
Talk to your partner: How can we find the area
of Amir’s bedroom since the measurements are
so large?
Concept Development (30 minutes)
• We can break the room up into two smaller rectangles
and add their areas together. Or we can also break
apart one of the factors in 7 × 15 to come up with a
multiplication sentence that is easier to solve.
• Decide with your partner which strategy you’ll use to
find the area. Then solve.
• What is the area of Amir’s bedroom? Yes! 105 square
feet.
• Share which strategy that you used to solve the
problem.
Concept Development (30 minutes)
Continue with the following suggested examples, encouraging
students to try different strategies:
• Maya helps her family tile the bathroom wall. It
measures 12 feet by 11 feet. How many square-foot
tiles does Maya need to cover the wall?
• Francis washes all of the windows outside his parents’
bookstore. There are 5 windows, each one is 6 feet
wide and 8 feet high. What is the total area of the
windows that Francis washes?
Problem Set (10 minutes)
You have 10 minutes to complete the problem set pages.
Debrief (10 minutes)
Let’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
3-4 Lesson 12
Homework
Worksheet
Is Due Tomorrow!

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Module 4 Lesson 12

  • 1. Multiplication and Area Topic D: Applications of Area Using Side Lengths of Figures Module 4: Lesson 12 Objective: Solve word problems involving area.
  • 2. Fluency Practice (15 minutes) Group Counting (3 min) • Fours to 40 • Sixes to 60 • Eights to 80 • Nines to 90
  • 3. Fluency Practice (11 minutes) Multiply by 7 (8 minutes) 7 x 7 = _______ Let’s skip count by sevens. 7, 14, 21, 28, 35, 42, 49. Let’s see how we can skip count down to find the answer too. Start at 70. 70, 63, 56, 49 Continue with the following sequence: 9 x 7, 6 x 7, and 8 x 7.
  • 4. Fluency Practice (11 minutes) Multiply by 7 pattern sheet (2 min) Let’s practice multiplying by 7. Be sure to work left to right across the page.
  • 5. Fluency Practice (11 minutes) Find side length (5 min) Say the area of the rectangle. What is the width of the rectangle? Complete the equation: 2 units x ____ units = 10 sq units Continue with the following possible sequence: 1 unit X ____ units = 8 square units, 5 units x ___ units = 15 sq units, 3 units x ____ units = 18 sq units, and 6 units x ____ units = 24 sq units
  • 6. Application Problem (5 minutes) • Find the area of a 6m by 9m rectangle. • Use the side lengths 6m by 9m to find different side lengths for a rectangle that has the same area. Show your equation using parentheses. Then estimate to draw the rectangle and label the side lengths.
  • 8. Concept Development (30 minutes) Part 1: Solve area word problems with 1 side length unknown. The area of Theo’s banner is 32 square feet. If the length of his banner measures 4 feet, how wide is it? What information is known? What is unknown? I’ll draw an area model and use a letter for the unknown.
  • 9. Concept Development (30 minutes) If the length is 4 feet and the area is 32 square feet, can the width be less than 4 feet? No, the width needs to be more than 4 feet. The width should be more than 4 feet because 4 times 4 only equals 16, but the area is 32 square feet.
  • 10. Concept Development (30 minutes) Talk to your partner: Is the area model I drew an accurate representation of the rectangle in the problem? How do you know? No, because the width should be much longer than the length. Work with your partner to correctly redraw my area model on your board.
  • 11. Concept Development (30 minutes) How can we find the value of w? Right! Divide 32 by 4! What is the value of w? 8! So what is the width of Theo’s banner? 8 feet!
  • 12. Concept Development (30 minutes) Part 2: Choose a strategy to find the area of a larger rectangle. Amir is getting carpet in his bedroom, which measures 7 feet by 15 feet. How many square feet of carpet will Amir need? Draw an area model to represent Amir’s bedroom. Write an expression that shows how to find the area.
  • 13. Concept Development (30 minutes) Talk to your partner: How can we find the area of Amir’s bedroom since the measurements are so large?
  • 14. Concept Development (30 minutes) • We can break the room up into two smaller rectangles and add their areas together. Or we can also break apart one of the factors in 7 × 15 to come up with a multiplication sentence that is easier to solve. • Decide with your partner which strategy you’ll use to find the area. Then solve. • What is the area of Amir’s bedroom? Yes! 105 square feet. • Share which strategy that you used to solve the problem.
  • 15. Concept Development (30 minutes) Continue with the following suggested examples, encouraging students to try different strategies: • Maya helps her family tile the bathroom wall. It measures 12 feet by 11 feet. How many square-foot tiles does Maya need to cover the wall? • Francis washes all of the windows outside his parents’ bookstore. There are 5 windows, each one is 6 feet wide and 8 feet high. What is the total area of the windows that Francis washes?
  • 16. Problem Set (10 minutes) You have 10 minutes to complete the problem set pages. Debrief (10 minutes) Let’s review your solutions for the problem set.
  • 17. 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!