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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 152 · 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. 1.187 + 49 =
  2. 2.135 + 37 =
  3. 3.378 + 58 =
  4. 4.315 + 37 =
  5. 5.32 + 58 =
  6. 6.31 + 97 =
  7. 7.86 + 29 =
  8. 8.471 + 87 =
  9. 9.496 + 79 =
  10. 10.184 + 57 =
  11. 11.129 + 59 =
  12. 12.479 + 27 =
  13. 13.28 + 78 =
  14. 14.304 + 97 =
  15. 15.248 + 68 =
  16. 16.122 + 58 =
  17. 17.113 + 29 =
  18. 18.340 + 87 =
  19. 19.308 + 38 =
  20. 20.431 + 27 =
  21. 21.264 + 28 =
  22. 22.101 + 89 =
  23. 23.377 + 47 =
  24. 24.308 + 39 =
  25. 25.474 + 29 =
  26. 26.390 + 37 =
  27. 27.236 + 78 =
  28. 28.467 + 28 =
  29. 29.373 + 97 =
  30. 30.67 + 49 =
  31. 31.441 + 77 =
  32. 32.140 + 39 =
  33. 33.288 + 27 =
  34. 34.166 + 17 =
  35. 35.421 + 77 =
  36. 36.440 + 39 =
  37. 37.479 + 67 =
  38. 38.296 + 47 =
  39. 39.451 + 58 =
  40. 40.102 + 58 =

Answer key

  1. 236
  2. 172
  3. 436
  4. 352
  5. 90
  6. 128
  7. 115
  8. 558
  9. 575
  10. 241
  11. 188
  12. 506
  13. 106
  14. 401
  15. 316
  16. 180
  17. 142
  18. 427
  19. 346
  20. 458
  21. 292
  22. 190
  23. 424
  24. 347
  25. 503
  26. 427
  27. 314
  28. 495
  29. 470
  30. 116
  31. 518
  32. 179
  33. 315
  34. 183
  35. 498
  36. 479
  37. 546
  38. 343
  39. 509
  40. 160

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