Eureka Math
1st Grade
Module 1
Lesson 20
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.
Customize this Slideshow
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
Materials Needed
I can apply the commutative property to count on from a larger addend.
Sparkle: Count By Tens, Starting at 5
We will play two games of Sparkle, counting by tens, starting at 5. For the first game, count the regular way. For the second game, count by tens the Say Ten Way.
Linking Cube Partners: 10
I’ll show you 10 linking cubes in a stick with a color change at the 5, and then remove it from sight. Break off a part and show the part to students. You will make a number bond and two number sentences to match the part shown and the part hidden.
Application Problem
Laura had 5 fish. Her mother gave her 1 more. Laura’s brother Frank had 1 fish. Their mother gave Frank 5 more. Laura cried, “That’s not fair! He has more fish than I do!”
Use number bonds and a number sentence to show Laura the truth. If you can, write a sentence with words that would help Laura understand.
Concept Development
Hold your expression card so the rest of the class cannot see it.
10
Concept Development
Find someone who has an expression card with a total equal to yours. When you find your partner, take an equal sign from the pile in front of the room, sit with your partner, and write a number sentence with your expression cards.
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Concept Development
Great job finding your partner. Here is one of the number sentences a partnership made.
1 + 7 = 7 + 1
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Concept Development
Does everyone agree that 1 plus 7 is the same amount as 7 plus 1?
1 + 7 = 7 + 1
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Concept Development
Let’s try counting on for both expressions to decide together.
1 + 7 = 7 + 1
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Concept Development
Now, let’s try the second expression.
1 + 7 = 7 + 1
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Concept Development
Let’s look at another number sentence.
3 + 5 = 5 + 3
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Concept Development
Does everyone agree that 3 plus 5 is the same amount as 5 plus 3?
3 + 5 = 5 + 3
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Concept Development
Let’s try counting on for both expressions to decide together.
3 + 5 = 5 + 3
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Concept Development
Now I’ll the expression cards, redistribute them, and you’ll play again.
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Concept Development
For 3 + 5 = 5 + 3, which way was the faster way to count on?
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Concept Development
Why was counting on 5 + 3 faster?
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Concept Development
What about when we solved 7 + 1 and 1 + 7? Discuss which was faster and why with your partner.
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Problem Set
Problem Set
Debrief
Exit Ticket