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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 991 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.488 + 29 =
  2. 2.161 + 97 =
  3. 3.388 + 19 =
  4. 4.345 + 99 =
  5. 5.465 + 68 =
  6. 6.372 + 17 =
  7. 7.379 + 37 =
  8. 8.78 + 77 =
  9. 9.434 + 29 =
  10. 10.314 + 67 =
  11. 11.182 + 59 =
  12. 12.203 + 37 =
  13. 13.172 + 78 =
  14. 14.49 + 79 =
  15. 15.404 + 98 =
  16. 16.35 + 39 =
  17. 17.76 + 67 =
  18. 18.416 + 49 =
  19. 19.87 + 28 =
  20. 20.97 + 29 =
  21. 21.271 + 28 =
  22. 22.322 + 37 =
  23. 23.278 + 88 =
  24. 24.407 + 58 =
  25. 25.55 + 97 =
  26. 26.25 + 58 =
  27. 27.138 + 99 =
  28. 28.497 + 27 =
  29. 29.299 + 69 =
  30. 30.67 + 49 =
  31. 31.42 + 17 =
  32. 32.430 + 38 =
  33. 33.432 + 98 =
  34. 34.142 + 99 =
  35. 35.45 + 38 =
  36. 36.353 + 19 =
  37. 37.113 + 19 =
  38. 38.100 + 67 =
  39. 39.44 + 27 =
  40. 40.168 + 67 =

Answer key

  1. 517
  2. 258
  3. 407
  4. 444
  5. 533
  6. 389
  7. 416
  8. 155
  9. 463
  10. 381
  11. 241
  12. 240
  13. 250
  14. 128
  15. 502
  16. 74
  17. 143
  18. 465
  19. 115
  20. 126
  21. 299
  22. 359
  23. 366
  24. 465
  25. 152
  26. 83
  27. 237
  28. 524
  29. 368
  30. 116
  31. 59
  32. 468
  33. 530
  34. 241
  35. 83
  36. 372
  37. 132
  38. 167
  39. 71
  40. 235

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