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Adding Up

Explore effective addition strategies with our comprehensive guide. Learn to identify whole numbers as multiples of ten or one hundred, and how to handle subtrahends close to these landmarks. This guide provides practical examples and exercises that range across various confidence levels, ensuring a strong grasp of addition in less time. Whether you're a student striving for mastery or an educator seeking to enhance your teaching methods, these strategies will improve your calculation efficiency and accuracy.

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Adding Up

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  1. Adding Up

  2. Category 1 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark number.

  3. 20 – 15 20 – 14 20 – 9 20 – 8

  4. 30 – 24 30 – 19 30 – 15 30 – 12

  5. 40 – 34 40 – 29 40 – 24 40 – 19

  6. 50 – 44 50 – 39 50 – 29 50 – 24

  7. 60 – 54 60 – 49 60 – 39 60 – 29

  8. 70 – 59 70 – 49 70 – 39 70 – 34

  9. 80 – 69 80 – 59 80 – 49 80 – 39

  10. 90 – 79 90 – 74 90 – 49 90 – 44

  11. 100 – 89 100 – 74 100 – 49 100 – 44

  12. Category 2 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark number.

  13. 100 – 89 100 – 69 100 – 49 100 – 37

  14. 150 – 124 150 – 149 150 – 124 150 – 99

  15. 250 – 224 250 – 219 200 – 199 200 – 149

  16. 300 – 269 300 – 249 300 – 99 300 – 149

  17. 400 – 349 400 – 299 400 – 274 200 – 199

  18. 500 – 449 500 – 419 500 – 299 500 – 249

  19. 750 – 709 750 – 599 750 – 449 750 – 324

  20. 1000 – 899 1000 – 749 1000 – 624 1000 – 499

  21. Category 3 Adding Up strategy : The whole number is NO longer an exact multiple of ten or one hundred. The subtrahend is farther distance from the whole.

  22. 50 – 29 50 – 29 50 – 48 50 – 37

  23. 80 – 59 84 – 59 81 – 48 81 – 36

  24. 70 – 49 73 – 49 76 – 67 76 – 39

  25. 100 – 75 120 – 75 125 – 75 125– 83

  26. 100 – 80 140 – 80 146 – 80 146– 89

  27. 200 – 149 250 – 149 223 – 186 245– 198

  28. 300 – 174 315 – 174 335 – 219 335– 287

  29. 400 – 329 420 – 329 423 – 318 444 – 298

  30. 500 – 249 525 – 249 1000 – 499 1000 – 671

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