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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 214 · 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. 1.170 + 97 =
  2. 2.417 + 39 =
  3. 3.402 + 57 =
  4. 4.401 + 28 =
  5. 5.93 + 58 =
  6. 6.417 + 48 =
  7. 7.121 + 19 =
  8. 8.459 + 29 =
  9. 9.84 + 27 =
  10. 10.431 + 68 =
  11. 11.281 + 38 =
  12. 12.223 + 28 =
  13. 13.286 + 49 =
  14. 14.59 + 88 =
  15. 15.441 + 57 =
  16. 16.441 + 38 =
  17. 17.400 + 17 =
  18. 18.165 + 28 =
  19. 19.48 + 28 =
  20. 20.336 + 88 =
  21. 21.266 + 68 =
  22. 22.152 + 38 =
  23. 23.47 + 27 =
  24. 24.297 + 38 =
  25. 25.82 + 28 =
  26. 26.216 + 37 =
  27. 27.263 + 47 =
  28. 28.477 + 37 =
  29. 29.365 + 59 =
  30. 30.49 + 27 =
  31. 31.97 + 79 =
  32. 32.38 + 89 =
  33. 33.80 + 78 =
  34. 34.464 + 87 =
  35. 35.54 + 27 =
  36. 36.314 + 17 =
  37. 37.293 + 48 =
  38. 38.413 + 29 =
  39. 39.135 + 19 =
  40. 40.188 + 27 =

Answer key

  1. 267
  2. 456
  3. 459
  4. 429
  5. 151
  6. 465
  7. 140
  8. 488
  9. 111
  10. 499
  11. 319
  12. 251
  13. 335
  14. 147
  15. 498
  16. 479
  17. 417
  18. 193
  19. 76
  20. 424
  21. 334
  22. 190
  23. 74
  24. 335
  25. 110
  26. 253
  27. 310
  28. 514
  29. 424
  30. 76
  31. 176
  32. 127
  33. 158
  34. 551
  35. 81
  36. 331
  37. 341
  38. 442
  39. 154
  40. 215

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