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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 421 · 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. 1.319 + 87 =
  2. 2.316 + 97 =
  3. 3.397 + 28 =
  4. 4.464 + 88 =
  5. 5.120 + 17 =
  6. 6.63 + 67 =
  7. 7.319 + 98 =
  8. 8.402 + 99 =
  9. 9.116 + 97 =
  10. 10.63 + 97 =
  11. 11.466 + 18 =
  12. 12.61 + 48 =
  13. 13.174 + 37 =
  14. 14.201 + 89 =
  15. 15.371 + 58 =
  16. 16.420 + 38 =
  17. 17.97 + 89 =
  18. 18.341 + 39 =
  19. 19.353 + 79 =
  20. 20.363 + 37 =
  21. 21.349 + 27 =
  22. 22.378 + 98 =
  23. 23.92 + 28 =
  24. 24.388 + 77 =
  25. 25.481 + 79 =
  26. 26.468 + 38 =
  27. 27.205 + 97 =
  28. 28.248 + 18 =
  29. 29.188 + 58 =
  30. 30.61 + 69 =
  31. 31.188 + 78 =
  32. 32.112 + 49 =
  33. 33.408 + 48 =
  34. 34.491 + 17 =
  35. 35.133 + 49 =
  36. 36.311 + 97 =
  37. 37.343 + 28 =
  38. 38.391 + 18 =
  39. 39.102 + 49 =
  40. 40.342 + 58 =

Answer key

  1. 406
  2. 413
  3. 425
  4. 552
  5. 137
  6. 130
  7. 417
  8. 501
  9. 213
  10. 160
  11. 484
  12. 109
  13. 211
  14. 290
  15. 429
  16. 458
  17. 186
  18. 380
  19. 432
  20. 400
  21. 376
  22. 476
  23. 120
  24. 465
  25. 560
  26. 506
  27. 302
  28. 266
  29. 246
  30. 130
  31. 266
  32. 161
  33. 456
  34. 508
  35. 182
  36. 408
  37. 371
  38. 409
  39. 151
  40. 400

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