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Flashcards

Mental Subtraction using addition in reverse.

Bruce Akitt Mathematics Grade 12 English 60 cards

Mental Subtraction using addition in reverse.

Cards in this deck (60)

  1. 1—
  2. 218 - 9 = ___Think: 18 = 9 + _9_
    So: 18 - 9 = _9_
  3. 317 - 8 = ___Think: 17 = 8 + _9_
    So: 17 - 8 = _9_
  4. 416 - 7 = ___Think: 16 = 7 + _9_
    So: 16 - 7 = _9_
  5. 515 - 6 = ___15 - 6 = _9_
  6. 614 - 5 = ___14 - 5 = _9_
  7. 713 - 4 = ___13 - 4 = _9_
  8. 812 - 3 = ___12 - 3 = _9_
  9. 911- 2 = ___11- 2 = _9_
  10. 1010 - 1 = ___10 - 1 = _9_
  11. 1116 - 8 = ___16 - 8 = _8_
  12. 1215 - 7 = ___15 - 7 = _8_
  13. 1310 - 1 = ___10 -1 = _9_
  14. 1414 - 6 = ___14 - 6 = _8_
  15. 1513 - 5 = ___13 - 5 = _8_
  16. 1612 - 4 = ___12 - 4 = _8_
  17. 1711 - 3 = ___11 - 3 = _8_
  18. 1810 - 2 = ___10 - 2 = _8_
  19. 199 - 1 = ___9 - 1 = _8_
  20. 2014 - 7 = ___14 - 7 = _7_
  21. 2113 - 6 = ___13 - 6 = _7_
  22. 2212 - 5 = ___12 - 5 = _7_
  23. 2311 - 4 = ___11 - 4 = _7_
  24. 2410 - 3 = ___10 - 3 = _7_
  25. 259 - 2 = ___9 - 2 = _7_
  26. 268 - 1 = ___8 - 1 = _7_
  27. 2712 - 6 = ___12 - 6 = _6_
  28. 2811 - 5 = ___11 - 5 = _6_
  29. 2910 - 4 = ___10 - 4 = _6_
  30. 309 - 3 = ___9 - 3 = _6_
  31. 318 - 2 = ___8 - 2 = _6_
  32. 327 - 1 - ___7 - 1 = _6_
  33. 3310 - 5 = ___10 - 5 = _5_
  34. 349 - 4 = ___9 - 4 = _5_
  35. 358 - 3 = ___8 - 3 = _5_
  36. 367 - 2 = ___7 - 2 = _5_
  37. 376 - 1 = ___6 - 1 = _5_
  38. 388 - 4 = ___8 - 4 = _4_
  39. 397 - 3 = ___7 - 3 = _4_
  40. 406 - 2 = ___6 - 2 = _4_
  41. 415 - 1 = ___5 - 1 = _4_
  42. 426 - 3 = ___6 - 3 = _3_
  43. 435 - 2 = ___5 - 2 = _3_
  44. 444 - 1 = ___4 - 1 = _3_
  45. 454 - 2 = ___4 - 2 = _2_
  46. 463 - 1 = ___3 - 1 = _2_
  47. 4717 - 9 = ___17 - 9 = _8_
  48. 4816 - 9 = ___16 - 9 = _7_
  49. 4915 - 9 = ___15 - 9 - _6_
  50. 5014 - 9 = ___14 - 9 = _5_
  51. 5113 - 9 - ___13 - 9 = _4_
  52. 5212 - 9 = ___12 - 9 = _3_
  53. 5311- 9 - ___11 - 9 = _2_
  54. 5410 - 9 = ___10 - 9 = _1_
  55. 5515 - 8 = ___15 - 8 = _7_
  56. 5614 - 8 = ___14 - 8 = _6_
  57. 5713 - 8 = ___13 - 8 = _5_
  58. 5812 - 8 = ___12 - 8 = _4_
  59. 5911 - 8 = ___11 - 8 = _3_
  60. 6010 - 8 = ___10 - 8 = _2_

Information

Description
Develop skill to automatically respond to subtraction facts by using addition facts in reverse. This will require the development and use of a previous skill to be able to automatically respond to any one of the four forms of an addition fact "family".
Created by
Bruce Akitt
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