1. Using Multiplication Facts to Find Division Facts
Literature Link: The Best of Times by Greg Tang
Lesson 1-9
CCSS 4.OA.2, 4.OA.3

2. MATH Essential Questions
What makes a computational strategy both effective and efficient?
MATH
Essential
Questions

3. MATH Essential Questions
Why do we say multiplication and division are inverse operations?
How can that help you make division easier?
How can you be certain that your answer is correct?
MATH
Essential
Questions

4. Samantha is recording the level of rain that falls each week in a container. If the pattern continues, how much rain falls in week 4?
Week
Inches of Rain 1 2 4 3 8

5. In This Lesson…
In this lesson, you will learn to solve division problems using your basic multiplication facts.

6. Write in Your Interactive Notebook on the Left Side (Your Side)
Multiplication and division are inverse operations (opposites). If you know your multiplication facts, how can that help you solve division problems?
Write in Your Interactive Notebook on the Left Side (Your Side)

7. Using Multiplication for Division
How can you solve this problem using multiplication?
Shanell has 42 pictures. She arranges them into 6 rows in her picture album. How many pictures are in each row?
Use Your White Board

8. Solving Division with Multiplication
Let’s say you have the problem
24 ÷ 3. If you aren’t sure what the answer is using division, you can think of it as a multiplication problem:
3 X ? = 24.
What multiplication fact can you use to solve this problem?
Use Your White Board

9. Write in Your Interactive Notebook on the Left Side (Your Side)
Problem 1
Jack has 30 pretzels for his birthday party. He arranges the pretzels in 5 rows with an equal number of pretzels in each row. How many pretzels does Jack put in each row? Solve and write the multiplication facts related to this problem.
Write in Your Interactive Notebook on the Left Side (Your Side)

10. Write in Your Interactive Notebook on the Left Side (Your Side)
Problem 2
Melissa is arranging her erasers into 3 equal groups. If she has 12 erasers, how many erasers are in each group? Solve and write the multiplication facts related to this problem.
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11. Write in Your Interactive Notebook on the Left Side (Your Side)
Problem 3
Caitlin bakes a rectangular cake. She divides the cake into 4 equal rows, making 16 total pieces. How many pieces of cake are in each row? Solve and write the multiplication facts related to this problem.
Write in Your Interactive Notebook on the Left Side (Your Side)

12. Write in Your Interactive Notebook on the Left Side (Your Side)
Problem 4
Mrs. Parker plants 36 flowers in her garden. She plants them in 4 rows with an equal number of flowers in each row. How many flowers does Mrs. Parker plant per row? Solve and write the multiplication facts related to this problem.
Write in Your Interactive Notebook on the Left Side (Your Side)

13. Write in Your Interactive Notebook on the Left Side (Your Side)
Fact Family Practice
Write the fact family for the following sets of numbers.
7, 8, 56
9, 2, 18
3, 9, 27
Write in Your Interactive Notebook on the Left Side (Your Side)

14. Lesson Wrap-Up
In this lesson, we learned to solve division problems using multiplication.

15. Classwork & Homework
Classwork: Reteaching 1-9
Homework: Practice 1-9

16. Reflection
Today's Reflection for Notebook: Which strategies work best for you to learn multiplication and division facts?

17. Website for Practice