This is a keynote for teaching 3rd graders how to process multiplication using repeated addition. There is a video, from Discovery Education, included in the presentation.
1. Repeated Addition
Today I can model the process of multiplication using
repeated addition.
Direct Guided Independent
Video
Instruction Practice Practice
Closure Chart Activity Formative
2. Essential Questions
1. What is multiplication?
2. How do you model the process of multiplication using
repeated addition?
6. Essential Vocabulary
process-steps or actions taken to achieve an answer
multiplication-is the process of adding equal sets together
factors-are the numbers multiplied together to get the
product/answer
7. Essential Vocabulary
process-steps or actions taken to achieve an answer
multiplication-is the process of adding equal sets together
factors-are the numbers multiplied together to get the
product/answer
product-is the answer when multiplying factors/numbers
together
8. Essential Vocabulary
process-steps or actions taken to achieve an answer
multiplication-is the process of adding equal sets together
factors-are the numbers multiplied together to get the
product/answer
product-is the answer when multiplying factors/numbers
together
repeated addition-repeatedly adding the same number
multiple times (ex. 5 + 5 + 5 + 5 = 20)
9. Anticipatory Set
Pretend your grandmother lives on a farm, and has 9 cats.
How many legs would there be altogether?
How would you solve for the answer?
12. Direction Instruction
Repeated addition is one model to use when solving this
problem.
Grandma has 9 cats.
Each cat has 4 legs.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 36 cat legs
13. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
14. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
4 + 4 +4 +4 +4+ 4 +4 +4 + 4
15. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 36 cat legs
16. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 36 cat legs
9 x 4 = 36 cat legs
17. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 36 cat legs
9 x 4 = 36 cat legs
cats
18. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 36 cat legs
9 x 4 = 36 cat legs
legs each
cats
19. Direction Instruction
Repeated addition takes several steps. Multiplication is a
faster way to total many of the same number.
Multiplication gives use the total in just one step.
Grandma has 9 cats. Each cat has 4 legs.
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 36 cat legs
9 x 4 = 36 cat legs
legs each
cats
Repeated addition is the
same as multiplication.
20. Direction Instruction
You are trying to make your AR Goal. For eight days, you
read six books each day. How many books did you read?
21. Direction Instruction
You are trying to make your AR Goal. For eight days, you
read six books each day. How many books did you read?
6 + 6 + 6 + 6 + +6 + 6 +6
22. Direction Instruction
You are trying to make your AR Goal. For eight days, you
read six books each day. How many books did you read?
6 + 6 + 6 + 6 + +6 + 6 +6 = 48 books
23. Direction Instruction
You are trying to make your AR Goal. For eight days, you
read six books each day. How many books did you read?
6 + 6 + 6 + 6 + +6 + 6 +6 = 48 books
8 days of reading, 6 books each day
repeated addition = many steps
multiplication = 1 step
24. Direction Instruction
You are trying to make your AR Goal. For eight days, you
read six books each day. How many books did you read?
6 + 6 + 6 + 6 + +6 + 6 +6 = 48 books
8 days of reading, 6 books each day
repeated addition = many steps
multiplication = 1 step 8 x 6 = 48 books
25. Direction Instruction
Watch as this video models the process of
multiplication using repeated addition.
http://player.discoveryeducation.com/index.cfm?
guidAssetId=29ca0dce-253f-4855-9ede-b921e5c5c375
26. Guided Practice
Your brother collects rocks. He keeps them in boxes. He
has 5 boxes with 7 rocks in each box. How many rocks
does he have?
repeated addition = many steps
7 + 7 + 7 + 7 + 7 = 35 rocks
multiplication = one step
5 x 7 = 35 rocks
28. Independent Practice
Directions: Use the cards (0-12) to make repeated addition
models for these multiplication problems.
1) 7 x 7 =
2) 8 x 3 =
3) 12 x 6 =
4) 2 x 10 =
5) 4 x 11 =
30. Closure
1. What is multiplication?
2. How do you model the process of multiplication using
repeated addition?
* You have one minute “think time”.
Click to start musical timer.
*Your have one minute to answer the questions.
Click to start musical timer.
* Be prepared to share.
31. Closure
1. What is multiplication?
2. How do you model the process of multiplication using
repeated addition?
* You have one minute “think time”.
Click to start musical timer.
*Your have one minute to answer the questions.
Click to start musical timer.
* Be prepared to share.
32. Closure
1. What is multiplication?
2. How do you model the process of multiplication using
repeated addition?
* You have one minute “think time”.
Click to start musical timer.
*Your have one minute to answer the questions.
Click to start musical timer.
* Be prepared to share.
33. 3rd Grade Survey
Repeated Addition Multiplication
100
75
50
25
0
July August September October
The survey was taken by one hundred 3rd graders on preference of repeated addition or multiplication. As student
became more comfortable processing multiplication using repeated addition they preferred multiplication to
repeated addition. Students realized multiplication was a faster and easier way to solve for the answer.
38. Independent Practice-Activity
On the next four slides are the number cards for students to build
repeated addition models to process multiplication.
Note: Slides can be printed out, laminated, and cut apart. Students
can be partnered up, for less cards needed.
42. 12 12 12 12 12 12
12 12 12 12 12 12
+ + + + + +
+ + + + + +
+ + + + + +
x x x x x x
x x x x x x
= = = = = =
43. Name ___________________________
Date
___________________
Formative:
(G3.1M.C2.PO3A) The Process of Multiplication Using Repeated Addition
Directions: Fill in the empty boxes with repeated addition or multiplication, the solve.
Repeated Addition Multiplication Solve
1) 3+3+3+3=
2) 7 x8=
3) 6+6+6+6+6+6=
4) 9x5=
5) 12 +12 +12 +12 +12+12 =
