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Unit 2, Lesson 1

Unit 2, Lesson 1. Addition Facts Strategies. Goals. Commutative and associative properties of addition Practice addition facts strategies. What We Will Learn Today. We are going to learn that we can add numbers in any order and still get the same answer.

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Unit 2, Lesson 1

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  1. Unit 2, Lesson 1 Addition Facts Strategies Unit 2, Lesson 1 Addition Facts Strategies

  2. Goals • Commutative and associative properties of addition • Practice addition facts strategies Unit 2, Lesson 1 Addition Facts Strategies

  3. What We Will Learn Today • We are going to learn that we can add numbers in any order and still get the same answer. • That can group numbers together any way we want when we add. • It is easier to add numbers when you make groups of ten. Unit 2, Lesson 1 Addition Facts Strategies

  4. Using a Ten • You will work in pairs. • Each pair will have 40 connecting cubes. • Materials getters, please get a bag of cubes and give 4 trains of 10 to each pair in your group. Please make sure that they have four different colors. Unit 2, Lesson 1 Addition Facts Strategies

  5. Using a Ten • You have enough cubes for you to do some of these activities on your own. • Some of the activities will require that you work together with your cubes. Unit 2, Lesson 1 Addition Facts Strategies

  6. Using a Ten • I want each student to take two different colors of connecting cubes. • Build one train with 7 cubes of one color. • Building another train with 8 cubes of another color. Unit 2, Lesson 1 Addition Facts Strategies

  7. Using a Ten • What can you do with your cubes to make a train of ten? • Yes, move two cubes from the train of seven cubes to the train of eight cubes. • Or, move three cubes from the train of eight cubes to the train of seven cubes. Unit 2, Lesson 1 Addition Facts Strategies

  8. Using a Ten • You now have a train of 10 cubes and a train of 5 cubes. What is the sum? • 15 • Why is this problem (10 + 5) easier to solve than the first one (7 + 8)? Unit 2, Lesson 1 Addition Facts Strategies

  9. Vocabulary • Addend – a number that is added to another • Sum – the answer to an addition sentence Unit 2, Lesson 1 Addition Facts Strategies

  10. Teaching the Activity • Do the following problems by making a train of one color for the first addend and a train of another color for the second addend. • 6 + 7 • Why is 10 + 3 easier to solve than 6 + 7? Unit 2, Lesson 1 Addition Facts Strategies

  11. Teaching the Activity • 8 + 8 • Why is 10 + 6 easier to solve than 8 + 8? Unit 2, Lesson 1 Addition Facts Strategies

  12. Teaching the Activity • 8 + 9 • Why is 10 + 7 easier to add than 8 + 9? Unit 2, Lesson 1 Addition Facts Strategies

  13. Switch It! • These next problems you will have to do in pairs. • Solve 14 + 7 + 6 with connecting cubes. Use a different color for each addend. • Group the cubes in as many tens as possible. Unit 2, Lesson 1 Addition Facts Strategies

  14. Switch It! • What can you do with the train of 14? • What can you group together to make a ten? • What is your answer? Unit 2, Lesson 1 Addition Facts Strategies

  15. Switch It! • Let’s share your solutions. Unit 2, Lesson 1 Addition Facts Strategies

  16. Challenge • Try to add 14 + 7 + 6 using mental arithmetic. • See if you can rearrange any of the numbers to make groups of ten. • How did you solve this without paper, pencil or cubes? Unit 2, Lesson 1 Addition Facts Strategies

  17. More Problems • Do these problems first with mental addition. Try to find groups of 10. You may also use doubles. • Then use your cubes. • 8 + 7 + 12 • 6 + 8 + 14 • 11 + 3 + 9 Unit 2, Lesson 1 Addition Facts Strategies

  18. Unit 2, Lesson 1 Addition Facts Strategies

  19. Vocabulary • Partition – To divide into parts. • Ex: 7 can be divided into 5 and 2 Unit 2, Lesson 1 Addition Facts Strategies

  20. Breaking Addends into Parts • Sometimes addends can be easily grouped into tens. • Sometimes this isn’t easy to see. • Try partitioning addends before finding groups of ten. Unit 2, Lesson 1 Addition Facts Strategies

  21. Breaking Addends into Parts • Example: 7 + 5 + 2 • The second addend, 5, can be rewritten as 3 + 2. • 7 + 3 + 2 + 2 • What two numbers can you group together to make 10? • What is the sum? Unit 2, Lesson 1 Addition Facts Strategies

  22. Breaking Addends into Parts • Work with your partners to solve the following problems. • Use your math notebook to write the number sentence and then show how you partitioned the number. Unit 2, Lesson 1 Addition Facts Strategies

  23. Breaking Addends into Part • 6 + 8 + 3 • 9 + 7 + 2 • 4 + 9 + 3 • Let’s compare your solutions. Unit 2, Lesson 1 Addition Facts Strategies

  24. My Calculator is Broken • We are going to imagine that some of the keys on the calculator are broken. • That means that you cannot use those keys. • . Unit 2, Lesson 1 Addition Facts Strategies

  25. My Calculator is Broken • First, let’s imagine the five is broken. • What keys would you press to do the problem 9 + 5 + 2? • Share your solutions. Unit 2, Lesson 1 Addition Facts Strategies

  26. My Calculator is Broken • Do these additional problems without using the 5 key. • 8 + 5 • Share your solutions • 5 + 7 + 6 • Share your solutions Unit 2, Lesson 1 Addition Facts Strategies

  27. My Calculator is Broken • 15 + 6 + 3 • Share your solutions • 9 + 25 • Share your solutions Unit 2, Lesson 1 Addition Facts Strategies

  28. What We have Learned • We learned that we can add numbers in any order and still get the same answer. • We can group numbers together any way we want when we add. • It is easier to add numbers when you make groups of ten. Unit 2, Lesson 1 Addition Facts Strategies

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