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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 113 · 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. 1.225 + 78 =
  2. 2.255 + 38 =
  3. 3.84 + 27 =
  4. 4.460 + 49 =
  5. 5.491 + 77 =
  6. 6.251 + 47 =
  7. 7.59 + 17 =
  8. 8.35 + 59 =
  9. 9.157 + 79 =
  10. 10.454 + 27 =
  11. 11.185 + 59 =
  12. 12.467 + 38 =
  13. 13.272 + 67 =
  14. 14.147 + 78 =
  15. 15.353 + 68 =
  16. 16.338 + 27 =
  17. 17.247 + 87 =
  18. 18.432 + 78 =
  19. 19.134 + 97 =
  20. 20.280 + 48 =
  21. 21.113 + 18 =
  22. 22.466 + 48 =
  23. 23.309 + 79 =
  24. 24.243 + 88 =
  25. 25.117 + 48 =
  26. 26.247 + 27 =
  27. 27.209 + 79 =
  28. 28.119 + 68 =
  29. 29.486 + 37 =
  30. 30.367 + 97 =
  31. 31.39 + 98 =
  32. 32.235 + 57 =
  33. 33.140 + 27 =
  34. 34.385 + 38 =
  35. 35.322 + 28 =
  36. 36.358 + 29 =
  37. 37.372 + 17 =
  38. 38.98 + 89 =
  39. 39.134 + 59 =
  40. 40.238 + 99 =

Answer key

  1. 303
  2. 293
  3. 111
  4. 509
  5. 568
  6. 298
  7. 76
  8. 94
  9. 236
  10. 481
  11. 244
  12. 505
  13. 339
  14. 225
  15. 421
  16. 365
  17. 334
  18. 510
  19. 231
  20. 328
  21. 131
  22. 514
  23. 388
  24. 331
  25. 165
  26. 274
  27. 288
  28. 187
  29. 523
  30. 464
  31. 137
  32. 292
  33. 167
  34. 423
  35. 350
  36. 387
  37. 389
  38. 187
  39. 193
  40. 337

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