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Subtraction Strategies Grades 3-5: Providing Hope Lori Williams, - PowerPoint PPT Presentation

Jul 02, 2023 •599 likes •745 views

Addition & Subtraction Strategies Grades 3-5: Providing Hope Lori Williams, Ph.D. dr.loriwilliams@sbcglobal.net 121 Facts to Go + 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 1. Zero Property + 0 1 2 3

  1. Addition & Subtraction Strategies Grades 3-5: Providing “Hope” Lori Williams, Ph.D. dr.loriwilliams@sbcglobal.net

  2. 121 Facts to Go + 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10

  3. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 0 21 Known Facts 0 1 2 3 4 5 6 7 8 9 10 100 Facts to Go 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10

  4. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 0 1 2 3 4 5 6 7 8 9 10 40 Known Facts 1 1 2 3 4 5 6 7 8 9 10 11 81 Facts to Go 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10 11

  5. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 1 57 Known Facts 1 2 3 4 5 6 7 8 9 10 11 64 Facts to Go 2 2 3 12 3 3 4 13 4 4 5 14 5 5 6 15 6 6 7 16 7 7 8 17 8 8 9 18 9 9 10 19 10 10 11 12 13 14 15 16 17 18 19 20

  6. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 65 Known Facts 2 2 3 4 12 56 Facts to Go 3 3 4 6 13 4 4 5 8 14 5 5 6 10 15 6 6 7 12 16 7 7 8 14 17 8 8 9 16 18 9 9 10 18 19 10 10 11 12 13 14 15 16 17 18 19 20

  7. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 5. Commutative Property 2 2 3 4 12 3 3 4 6 13 65 Known Facts 28 Facts to Go 4 4 5 8 14 5 5 6 10 15 6 6 7 12 16 7 7 8 14 17 8 8 9 16 18 9 9 10 18 19 10 10 11 12 13 14 15 16 17 18 19 20

  8. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 5. Commutative Property 2 2 3 4 5 6 7 8 9 10 11 12 3 3 4 5 6 13 6. + 2 (Counting On) 4 4 5 6 8 14 79 Known Facts 5 5 6 7 10 15 21 Facts to Go 6 6 7 8 12 16 7 7 8 9 14 17 8 8 9 10 16 18 9 9 10 11 18 19 10 10 11 12 13 14 15 16 17 18 19 20

  9. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 5. Commutative Property 2 2 3 4 5 6 7 8 9 10 11 12 3 3 4 5 6 10 13 6. + 2 (Counting On) 7. Subitizing on 10 4 4 5 6 8 10 14 Frame / 5 5 6 7 10 15 Combos to Make 10 6 6 7 8 10 12 16 7 83 Known Facts 7 8 9 10 14 17 19 Facts to Go 8 8 9 10 16 18 9 9 10 11 18 19 10 10 11 12 13 14 15 16 17 18 19 20

  10. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 5. Commutative Property 2 2 3 4 5 6 7 8 9 10 11 12 3 3 4 5 6 10 11 12 13 6. + 2 (Counting On) 7. Subitizing on 10 4 4 5 6 8 10 11 12 13 14 Frame / 5 5 6 7 10 11 12 13 14 15 Combos to Make 10 6 6 7 8 10 11 12 13 14 15 16 8. Go through 10 7 7 8 9 10 11 12 13 14 15 16 17 113 Known Facts 8 8 9 10 11 12 13 14 15 16 17 18 4 Facts to Go 9 9 10 11 12 13 14 15 16 17 18 19 10 10 11 12 13 14 15 16 17 18 19 20

  11. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 5. Commutative Property 2 2 3 4 5 6 7 8 9 10 11 12 3 3 4 5 6 7 8 10 11 12 13 6. + 2 (Counting On) 7. Subitizing on 10 4 4 5 6 7 8 9 10 11 12 13 14 Frame / 5 5 6 7 8 9 10 11 12 13 14 15 Combos to Make 10 6 6 7 8 10 11 12 13 14 15 16 8. Go through 10 7 9. + 5 / Go 7 8 9 10 11 12 13 14 15 16 17 through 5 8 8 9 10 11 12 13 14 15 16 17 18 (Visualize the 10 frame) 9 9 10 11 12 13 14 15 16 17 18 19 119 Known Facts 10 1 Fact to Go 10 11 12 13 14 15 16 17 18 19 20

  12. 1. Zero Property + 0 1 2 3 4 5 6 7 8 9 10 2. + 1 (Counting On) 0 3. + 10 (teen numbers) 0 1 2 3 4 5 6 7 8 9 10 4. Doubles 1 1 2 3 4 5 6 7 8 9 10 11 5. Commutative Property 2 2 3 4 5 6 7 8 9 10 11 12 3 3 4 5 6 7 8 9 10 11 12 13 6. + 2 (Counting On) 7. Subitizing on 10 4 4 5 6 7 8 9 10 11 12 13 14 Frame / 5 5 6 7 8 9 10 11 12 13 14 15 Combos to Make 10 6 6 7 8 9 10 11 12 13 14 15 16 8. Go through 10 7 9. + 5 / Go 7 8 9 10 11 12 13 14 15 16 17 through 5 8 8 9 10 11 12 13 14 15 16 17 18 (Visualize the 10 frame) 10.Memorize 6 + 3 9 9 10 11 12 13 14 15 16 17 18 19 10 121 Known Facts 10 11 12 13 14 15 16 17 18 19 20

  13. - 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 0 0 1 2 3 4 5 6 7 8 9 10 1 0 1 2 3 4 5 6 7 8 9 10 2 0 1 2 3 4 5 6 7 8 9 10 3 0 1 2 3 4 5 6 7 8 9 10 4 0 1 2 3 4 5 6 7 8 9 10 5 0 1 2 3 4 5 6 7 8 9 10 6 0 1 2 3 4 5 6 7 8 9 10 7 0 1 2 3 4 5 6 7 8 9 10 8 0 1 2 3 4 5 6 7 8 9 10 9 0 1 2 3 4 5 6 7 8 9 10 10 0 1 2 3 4 5 6 7 8 9 10 -0 & number minus itself • -1 & -2 /close together numbers (Count back a couple or count on a couple) • Back 10 / Back to 10 (The teen numbers) • Up through & Back through 5 (e.g., “it takes 2 to get from 3 to 5 and one • more to get to 6, 2 +1 is 3” OR 6 – 3 = 6 – 1 – 2) (visualize the 10 frame) Back through 10 (e.g., 13 - 4 = 13 – 3 – 1) • Up through 10 (e.g. 13 – 9 “count on 1 to get 10 and 3 more to get to 13, so 9 • is 4 away from 13”) Think addition / Think addition doubles (13 – 9 = ? Is the same as 9+? = 13) •

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