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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 763 · 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. 1.300 + 47 =
  2. 2.359 + 78 =
  3. 3.200 + 37 =
  4. 4.493 + 49 =
  5. 5.340 + 88 =
  6. 6.203 + 19 =
  7. 7.140 + 18 =
  8. 8.121 + 99 =
  9. 9.426 + 49 =
  10. 10.338 + 79 =
  11. 11.254 + 38 =
  12. 12.76 + 28 =
  13. 13.164 + 47 =
  14. 14.147 + 37 =
  15. 15.268 + 98 =
  16. 16.370 + 69 =
  17. 17.406 + 57 =
  18. 18.311 + 49 =
  19. 19.108 + 59 =
  20. 20.132 + 98 =
  21. 21.123 + 38 =
  22. 22.460 + 58 =
  23. 23.107 + 37 =
  24. 24.140 + 59 =
  25. 25.263 + 29 =
  26. 26.162 + 67 =
  27. 27.123 + 89 =
  28. 28.318 + 78 =
  29. 29.309 + 78 =
  30. 30.240 + 27 =
  31. 31.325 + 77 =
  32. 32.405 + 78 =
  33. 33.70 + 27 =
  34. 34.322 + 29 =
  35. 35.192 + 48 =
  36. 36.198 + 59 =
  37. 37.40 + 58 =
  38. 38.372 + 29 =
  39. 39.402 + 37 =
  40. 40.85 + 97 =

Answer key

  1. 347
  2. 437
  3. 237
  4. 542
  5. 428
  6. 222
  7. 158
  8. 220
  9. 475
  10. 417
  11. 292
  12. 104
  13. 211
  14. 184
  15. 366
  16. 439
  17. 463
  18. 360
  19. 167
  20. 230
  21. 161
  22. 518
  23. 144
  24. 199
  25. 292
  26. 229
  27. 212
  28. 396
  29. 387
  30. 267
  31. 402
  32. 483
  33. 97
  34. 351
  35. 240
  36. 257
  37. 98
  38. 401
  39. 439
  40. 182

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