Mastering Division Through Repeated Subtraction
Division as Repeated Subtraction
Lesson 7-2
CCSS 3.OA.2, 3.OA.3, 3.OA.4
Think and write…
•
What are some situations where you need
to divide a certain number of things into
equal groups?
Sample Division Problem
Liam made 12 tacos. He wants to give 2 tacos
each to his friends. How many friends can get
tacos? Write a number sentence and solve.
How can I solve that problem?
•
1. Make pictures
•
2. Mental math
•
3. Repeated subtraction
Parts of the Problem
12 ÷ 2 = 6
•
What does the 12 represent?
•
What does the 2 represent?
•
What does the 6 represent?
Alternative Situations
•
12 tacos, 3 to each friend
•
12 tacos, 4 to each friend
•
Which situation would allow Liam to give
tacos to more friends? Why?
Problem 1
•
Angelina has 10 strawberries. If she has 1
friend over, how many strawberries will each
girl get if they share equally?
Problem 2
•
Kevin has 16 gloves. If there are 2 gloves in
each pair, how many pairs does he have? Solve
and explain.
Problem 3
•
There are 16 lizards and 4 branches in the
cage. How many lizards sit on each branch if
they put themselves in equal groups?
Problem 4
•
Malachi has 15 tennis balls. If he puts 3
balls in a can, how many cans will he
need?
Problem 5
•
In the aquarium, there are 24 fish. If there are
4 tanks, and Elijah puts equal amounts of fish
in each tank, how many fish will be in a tank?
Problem 6
•
Nick has 28 chocolate bars. He gives an equal
amount of chocolate bars to 7 friends. How
many chocolate bars does each friend get?
Literature Link: The Doorbell Rang by Pat Hutchins
Explore the concept of division as repeated subtraction with engaging examples and thought-provoking problems. Practice dividing items into equal groups, enhance problem-solving skills, and deepen understanding of division concepts. From dividing tacos among friends to distributing strawberries and fish, this lesson covers various scenarios to reinforce division skills effectively.
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Presentation Transcript
Division as Repeated Subtraction Lesson 7-2 CCSS 3.OA.2, 3.OA.3, 3.OA.4
Think and write What are some situations where you need to divide a certain number of things into equal groups?
Sample Division Problem Liam made 12 tacos. He wants to give 2 tacos each to his friends. How many friends can get tacos? Write a number sentence and solve.
How can I solve that problem? 1. Make pictures 2. Mental math 3. Repeated subtraction
Parts of the Problem 12 2 = 6 What does the 12 represent? What does the 2 represent? What does the 6 represent?
Alternative Situations 12 tacos, 3 to each friend 12 tacos, 4 to each friend Which situation would allow Liam to give tacos to more friends? Why?
Problem 1 Angelina has 10 strawberries. If she has 1 friend over, how many strawberries will each girl get if they share equally?
Problem 2 Kevin has 16 gloves. If there are 2 gloves in each pair, how many pairs does he have? Solve and explain.
Problem 3 There are 16 lizards and 4 branches in the cage. How many lizards sit on each branch if they put themselves in equal groups?
Problem 4 Malachi has 15 tennis balls. If he puts 3 balls in a can, how many cans will he need?
Problem 5 In the aquarium, there are 24 fish. If there are 4 tanks, and Elijah puts equal amounts of fish in each tank, how many fish will be in a tank?
Problem 6 Nick has 28 chocolate bars. He gives an equal amount of chocolate bars to 7 friends. How many chocolate bars does each friend get?
