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6.1 The Addition/Subtraction Facts Table

6.1 The Addition/Subtraction Facts Table Objectives: To provide experience exploring patterns in sums of two dice; and to introduce the Addition/Subtraction Facts Table. Math Journal 2----- pages 109, 110 Home Link Math Masters Pages 162 and 163 Math Masters page 324

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6.1 The Addition/Subtraction Facts Table

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  1. 6.1 The Addition/Subtraction Facts Table Objectives: To provide experience exploring patterns in sums of two dice; and to introduce the Addition/Subtraction Facts Table. Math Journal 2----- pages 109, 110 Home Link Math Masters Pages 162 and 163 Math Masters page 324 2 dice per partnership slate number cards 0-9 (four of each) tool-kit pennies Enrichment: 2 sets of 6/6 dominoes 2 polyhedral dice per partnership chart paper Addition Subtraction Chart PDF will open in normal mode, not slide show mode for printing. Animation on some slides is only visible in slide show mode.

  2. Math Message: On our slate, write two addition facts that have 5 as a sum.

  3. What facts did you write? We will write each sum-of-5 fact as a number model on this board until all of the facts and their turn-arounds are listed. Do not repeat a fact.

  4. Make a record dice- throw record of facts for two numbers.

  5. Student Page, Math Journal 2, Page 109

  6. Thinking time . . . be ready to answer: How many ways can you roll 2 or 12? How many ways can you roll 9 (or 5)? Why are there more facts in the 7 column than in any of the other columns? For which sums are there an even number of facts? Why do odd sums have an even umber of facts? For which sums are there an odd number of facts? Why do even sums have an odd number of facts?

  7. Good Work!

  8. The addition/subtraction facts table:

  9. What is 9 plus 8? Use any strategy you wish to find the sum. Now we will find 9 + 8 using the addition/subtraction facts table. Get a sheet of paper and put an arrow in the lower left corner. OK! Now we will find 9 + 8 using the addition/subtraction facts table. Next slide, please.

  10. FOLLOW ALONG AS WE TRY SOME PROBLEMS. Listen carefully.

  11. Addition Top-It Directions: 1. Shuffle the deck and place it number-side down. 2. Each player turns over 2 cards and call out the sum. Use the addition/subtraction Facts Table, if necessary. 3. The players with the largest sum wins the round and takes all of the cards. 4. In case of a tie, each tied player turns over 2 more cards. The player with the largest sum takes all of the cards from both plays. 5. The game ends when not enough cards are left for each player to have another turn. 6. The player with the most cards win. Alternative: Play for the lowest sum, and the player with the least cards wins. Tally the "cards" each player wins . . .

  12. Student page 110 Home links 162 and 163.

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