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Making Landmark or Friendly Numbers

Dive into the fascinating world of numbers designed to be one away from landmark or friendly numbers. This exploration includes various categories, presenting computational problems with two and three-digit addends. You’ll encounter interesting patterns, learn how certain numbers relate to multiples of ten, and uncover methods to solve unique arithmetic challenges. Whether you're a math enthusiast or looking to improve your computational skills, this guide provides a comprehensive look at how numbers can interact in surprising ways.

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Making Landmark or Friendly Numbers

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  1. Making Landmark or Friendly Numbers

  2. Category 1 Designed to be one away from a landmark or friendly number

  3. 19 + 2 19 + 5 19 + 8 19 + 12

  4. 9 + 8 19 + 5 9 + 26 16 + 19

  5. 7 + 19 16 + 29 19 + 18 29 + 33

  6. 39 + 16 28 + 39 59 + 13 23 + 49

  7. 25 + 25 25 + 26 24 + 26 26 + 49

  8. 49 + 8 49 + 23 49 + 37 49 + 51

  9. 46 + 59 44 + 69 58 + 39 76 + 24

  10. 37 + 69 79 + 26 89 + 28 99 + 19

  11. 99 + 5 99 + 15 99 + 26 99 + 51

  12. Category 2 Consists of one addend that is two away from a multiple of ten or a landmark number

  13. 8 + 5 8 + 13 8 + 24 18 + 7

  14. 8 + 4 18 + 6 28 + 17 27 + 28

  15. 28 + 16 25 + 38 23 + 27 28 + 45

  16. 18 + 63 38 + 37 67 + 28 48 + 52

  17. 48 + 6 48 + 17 23 + 48 48 + 47

  18. 58 + 36 24 + 78 88 + 14 68 + 33

  19. 98 + 5 98 + 13 98 + 34 98 + 52

  20. 8 + 4 + 18 18 + 4 + 18 28 + 5 + 27 24 + 3 + 48

  21. 48 + 4 + 48 48 + 49 + 3 98 + 97 + 5 99 + 98 + 97 + 5

  22. Category 3 Consists of computational problems with two- and three-digit addends. The addends are one or more away from a multiple of ten or landmark number.

  23. 99 + 38 98 + 47 98 + 99 99 + 99 + 5

  24. 119 + 26 118 + 17 129 + 16 124 + 26

  25. 36 + 109 49 + 108 119 + 48 126 + 124

  26. 116 + 29 39 + 127 114 + 118 46 + 118

  27. 198 + 7 199 + 13 148 + 27 139 + 43

  28. 128 + 34 119 + 36 56 + 129 126 + 49

  29. 119 + 119 149 + 149 129 + 139 199 + 199

  30. 249 + 22 248 + 49 225 + 49 299 + 26

  31. 999 + 99 998 + 49 997 + 199 199 + 99 + 49

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