Eureka Math
3rd Grade
Module 1
Lesson 1
At the request of elementary teachers, a team of Bethel & Sumner educators met as a committee to create Eureka slideshow presentations. These presentations are not meant as a script, nor are they required to be used. Please customize as needed. Thank you to the many educators who contributed to this project!
Directions for customizing presentations are available on the next slide.
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Reflecting your Teaching Style and Learning Needs of Your Students
Screen A
“pop-out”
Screen B
Icons
Read, Draw, Write
Learning Target
Think Pair Share
Individual
Partner
Whole Class
Small Group Time
Small Group
Personal White Board
Problem Set
Manipulatives Needed
Fluency
I can understand equal groups of as multiplication.
Group Counting
Count to 20 forward and backward.
Say all of the numbers. Watch my fingers to know whether to count up or down. A closed hand means stop.
Count up
Count down
Group Counting
Whisper every other number.
Group Counting
Hum every other number. As you hum, think of the number.
Group Counting
Think every other number instead of humming.
Group Counting
What did we just count by?
Application Problem
There are 83 girls and 76 boys in the third grade. How many total students are in the third grade?
Skip Counting
How many arms does each student have?
Skip Counting
How many arms do ten students have?
Since each student represents a group of two arms, let’s skip count by twos to find how many arms they have together.
Skip Counting
How many twos did we count to find the total?
Skip Counting
What did we count to find the number of twos?
Skip Counting
Skip count again to find the total number of arms.*
Skip Counting
Do we have the correct number of twos in our addition sentence?*
Skip Counting
Do you agree that 10 groups of 2 is 20?
Equal Groups
You have 12 counters. Use your counters to make equal groups of 2.
How many equal groups of 2 did you make?
Equal Groups
6 equal groups of how many counters?
Write an addition sentence to show your groups on your personal white board.
Equal Groups
In unit form, how many twos did we add to make 12?
Equal Groups
2 + 2 + 2 + 2 + 2 + 2 = 12
Equal Groups
6 twos = 12
Equal Groups
6 x 2 = 12
Equal Groups
How do you think 6 x 2 = 12 relates to the other number sentences?
6 x 2 = 12
2 + 2 + 2 + 2 + 2 + 2 = 12
6 twos = 12
Equal Groups and Multiplication
Ways that are easier and faster are efficient.
When we have equal groups, multiplication is a more efficient way to find the total than repeated addition.
Let’s try with differently sized groups.
Equal Groups
You have 12 counters. Use your counters to make equal groups of 3.
Equal Groups
How many equal groups of 3 did you make?
Equal Groups
4 equal groups of how many counters?
Equal Groups
Write an addition sentence to show your groups on your personal white board.
Equal Groups
In unit form, how many threes did we add to make 12?
Equal Groups
3 + 3 + 3 + 3 = 12
Equal Groups
4 threes = 12
Equal Groups
4 x 3 = 12
Equal Groups
How does 4 x 3 = 12 relates to the other number sentences?
4 x 3 = 12
3 + 3 + 3 + 3 = 12
4 threes = 12
Equal Groups
You have 12 counters. Use your counters to make equal groups of 6.
How many equal groups of 6 did you make?
2 equal groups of how many counters?
Write an addition sentence to show your groups on your personal white board.
Equal Groups
In unit form, how many sixes did we add to make 12?
6 + 6 = 12
2 sixes = 12
2 x 6 = 12
How does 2 x 6 = 12 relates to the other number sentences?
Equal Groups
You have 12 counters. Use your counters to make equal groups of 4.
How many equal groups of 4 did you make?
Equal Groups
3 equal groups of how many counters?
Write an addition sentence to show your groups on your personal white board.
Equal Groups
In unit form, how many fours did we add to make 12?
Equal Groups
4 + 4 + 4 = 12
Equal Groups
3 fours = 12
Equal Groups
How does 3 x 4 = 12 relates to the other number sentences?
4 + 4 + 4 = 12
3 fours = 12
Multiplication Sentences
These are equal groups. Turn and tell your partner why they are equal.
Multiplication Sentences
Work with your partner to write a repeated addition and a multiplication sentence for this picture.
Multiplication Sentences
Check my work by writing an addition sentence and counting to find the total number of objects.
3 x 4 = 12
Multiplication Sentences
Use your addition sentence as you talk to your partner about why you agree or disagree with my work.
3 x 4 = 12
Multiplication Sentences
Do you agree or disagree with my work? Why?
I agree because ________________.
I disagree because _____________.
To multiply, you must have equal groups.
Multiplication Sentences
To multiply, you must have equal groups.
Problem Set
Debrief
On the first page of the problem set, what did you notice about your answers?
Discuss the relationship between repeated addition and the unit form 2 groups of three or 3 groups of two, depending on the drawing.
Discuss the relationship between repeated addition, unit form, and the multiplication sentence 3 x 2 = 6.
Review the new vocabulary presented in the lesson:
Exit Ticket