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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 522 · 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. 1.479 + 68 =
  2. 2.204 + 47 =
  3. 3.344 + 39 =
  4. 4.352 + 78 =
  5. 5.335 + 19 =
  6. 6.394 + 59 =
  7. 7.83 + 57 =
  8. 8.115 + 17 =
  9. 9.157 + 49 =
  10. 10.29 + 27 =
  11. 11.380 + 19 =
  12. 12.117 + 19 =
  13. 13.240 + 39 =
  14. 14.137 + 27 =
  15. 15.192 + 58 =
  16. 16.150 + 59 =
  17. 17.448 + 48 =
  18. 18.237 + 59 =
  19. 19.173 + 27 =
  20. 20.321 + 27 =
  21. 21.404 + 68 =
  22. 22.331 + 59 =
  23. 23.240 + 87 =
  24. 24.120 + 27 =
  25. 25.395 + 38 =
  26. 26.122 + 49 =
  27. 27.331 + 97 =
  28. 28.253 + 28 =
  29. 29.282 + 37 =
  30. 30.453 + 77 =
  31. 31.71 + 38 =
  32. 32.344 + 29 =
  33. 33.455 + 58 =
  34. 34.144 + 79 =
  35. 35.389 + 49 =
  36. 36.425 + 47 =
  37. 37.93 + 98 =
  38. 38.194 + 47 =
  39. 39.225 + 19 =
  40. 40.124 + 99 =

Answer key

  1. 547
  2. 251
  3. 383
  4. 430
  5. 354
  6. 453
  7. 140
  8. 132
  9. 206
  10. 56
  11. 399
  12. 136
  13. 279
  14. 164
  15. 250
  16. 209
  17. 496
  18. 296
  19. 200
  20. 348
  21. 472
  22. 390
  23. 327
  24. 147
  25. 433
  26. 171
  27. 428
  28. 281
  29. 319
  30. 530
  31. 109
  32. 373
  33. 513
  34. 223
  35. 438
  36. 472
  37. 191
  38. 241
  39. 244
  40. 223

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