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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 218 · 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. 1.388 + 88 =
  2. 2.414 + 37 =
  3. 3.101 + 27 =
  4. 4.100 + 78 =
  5. 5.379 + 99 =
  6. 6.125 + 28 =
  7. 7.237 + 97 =
  8. 8.471 + 37 =
  9. 9.288 + 99 =
  10. 10.233 + 57 =
  11. 11.474 + 77 =
  12. 12.396 + 49 =
  13. 13.394 + 98 =
  14. 14.442 + 17 =
  15. 15.146 + 29 =
  16. 16.190 + 27 =
  17. 17.393 + 28 =
  18. 18.217 + 17 =
  19. 19.387 + 88 =
  20. 20.105 + 58 =
  21. 21.173 + 78 =
  22. 22.421 + 47 =
  23. 23.165 + 27 =
  24. 24.102 + 39 =
  25. 25.248 + 29 =
  26. 26.172 + 88 =
  27. 27.104 + 39 =
  28. 28.394 + 29 =
  29. 29.119 + 49 =
  30. 30.321 + 77 =
  31. 31.483 + 19 =
  32. 32.448 + 39 =
  33. 33.160 + 17 =
  34. 34.118 + 28 =
  35. 35.438 + 37 =
  36. 36.197 + 59 =
  37. 37.340 + 77 =
  38. 38.125 + 47 =
  39. 39.212 + 78 =
  40. 40.365 + 88 =

Answer key

  1. 476
  2. 451
  3. 128
  4. 178
  5. 478
  6. 153
  7. 334
  8. 508
  9. 387
  10. 290
  11. 551
  12. 445
  13. 492
  14. 459
  15. 175
  16. 217
  17. 421
  18. 234
  19. 475
  20. 163
  21. 251
  22. 468
  23. 192
  24. 141
  25. 277
  26. 260
  27. 143
  28. 423
  29. 168
  30. 398
  31. 502
  32. 487
  33. 177
  34. 146
  35. 475
  36. 256
  37. 417
  38. 172
  39. 290
  40. 453

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