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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 599 · 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. 1.206 + 97 =
  2. 2.263 + 37 =
  3. 3.415 + 78 =
  4. 4.305 + 89 =
  5. 5.313 + 18 =
  6. 6.91 + 49 =
  7. 7.180 + 78 =
  8. 8.303 + 59 =
  9. 9.123 + 29 =
  10. 10.248 + 89 =
  11. 11.87 + 87 =
  12. 12.382 + 68 =
  13. 13.378 + 99 =
  14. 14.474 + 57 =
  15. 15.88 + 49 =
  16. 16.127 + 17 =
  17. 17.499 + 58 =
  18. 18.481 + 27 =
  19. 19.445 + 38 =
  20. 20.213 + 97 =
  21. 21.49 + 27 =
  22. 22.108 + 57 =
  23. 23.296 + 29 =
  24. 24.233 + 28 =
  25. 25.227 + 69 =
  26. 26.120 + 28 =
  27. 27.100 + 97 =
  28. 28.228 + 97 =
  29. 29.157 + 78 =
  30. 30.42 + 38 =
  31. 31.374 + 78 =
  32. 32.64 + 18 =
  33. 33.264 + 37 =
  34. 34.432 + 67 =
  35. 35.494 + 67 =
  36. 36.323 + 88 =
  37. 37.241 + 48 =
  38. 38.252 + 59 =
  39. 39.340 + 39 =
  40. 40.35 + 17 =

Answer key

  1. 303
  2. 300
  3. 493
  4. 394
  5. 331
  6. 140
  7. 258
  8. 362
  9. 152
  10. 337
  11. 174
  12. 450
  13. 477
  14. 531
  15. 137
  16. 144
  17. 557
  18. 508
  19. 483
  20. 310
  21. 76
  22. 165
  23. 325
  24. 261
  25. 296
  26. 148
  27. 197
  28. 325
  29. 235
  30. 80
  31. 452
  32. 82
  33. 301
  34. 499
  35. 561
  36. 411
  37. 289
  38. 311
  39. 379
  40. 52

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