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Lesson # 3

Lesson # 3. Searching For Compatibles. Numbers !!!. Not Boyfriends and Girlfriends !. Compatible numbers give you a sum…. That is easy to use… in your head. For example…. 75 + 17 + 83 + 25 = ?. 75 + 17 + 83 + 25 = ?. 75 and 25 are Compatible. 17 and 83 are Compatible.

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Lesson # 3

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  1. Lesson # 3 Searching For Compatibles

  2. Numbers !!! Not Boyfriends and Girlfriends !

  3. Compatible numbers give you a sum… That is easy to use… in your head.

  4. For example… 75 + 17 + 83 + 25 = ?

  5. 75 + 17 + 83 + 25 = ? 75 and 25 are Compatible. 17 and 83 are Compatible. 75 + 25 = 100 17 + 83 = 100

  6. So… 75 + 17 + 83 + 25 = 200 By finding and adding the compatibles!

  7. Which of these problems contain compatible numbers? 29 + 71 87 + 29 29 + 837 30 + 270 465 + 35

  8. a) 29 + 71 (Compatible)b) 87 + 29 (Not)c) 29 + 837 (Not)d) 30 + 270 (Compatible)e) 465 + 35 (Compatible)

  9. You can make your own compatibles… In your head !

  10. For example… When adding 75 + 29

  11. Leave 75, but make a compatible… out of the 29 (think 25)

  12. So adding 75 + 29 Is like adding 75 + 25 = 100 then adding the 4 = 104.

  13. And now 10 questions for practice. Get ready to write down ONLY the answer.

  14. Question # 1 75 + 28 = ?

  15. Question # 2 69 + 35 = ?

  16. Question # 3 188 + 213 = ?

  17. Question # 4 427 + 75 = ?

  18. Question # 5 450 + 65 = ?

  19. Question # 6 580 + 423 = ?

  20. Question # 7 795 + 206 = ?

  21. Question # 8 253 + 752 = ?

  22. Question # 9 1150 + 356 = ?

  23. Question # 10 1250 + 757 = ?

  24. And now for the answers… Get Ready…

  25. Question # 175 + 28 = 103

  26. Question # 269 + 35 = 104

  27. Question # 3188 + 213 = 401

  28. Question # 4427 + 75 = 502

  29. Question # 5450 + 65 = 515

  30. Question # 6580 + 423 = 1003

  31. Question # 7795 + 206 = 1001

  32. Question # 8253 + 752 = 1005

  33. Question # 91150 + 356 = 1506

  34. Question # 101250 + 757 = 2007

  35. Not quite…The End !

  36. Practice this… As Often As Possible And you will get very good at it !

  37. And now… The End !

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