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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 312 · 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. 1.464 + 87 =
  2. 2.470 + 19 =
  3. 3.59 + 78 =
  4. 4.172 + 19 =
  5. 5.112 + 17 =
  6. 6.170 + 99 =
  7. 7.261 + 89 =
  8. 8.463 + 89 =
  9. 9.324 + 39 =
  10. 10.380 + 97 =
  11. 11.365 + 99 =
  12. 12.469 + 39 =
  13. 13.231 + 47 =
  14. 14.39 + 98 =
  15. 15.230 + 27 =
  16. 16.74 + 78 =
  17. 17.164 + 39 =
  18. 18.33 + 89 =
  19. 19.151 + 29 =
  20. 20.464 + 27 =
  21. 21.489 + 29 =
  22. 22.467 + 97 =
  23. 23.109 + 39 =
  24. 24.480 + 79 =
  25. 25.107 + 37 =
  26. 26.55 + 67 =
  27. 27.139 + 47 =
  28. 28.491 + 17 =
  29. 29.304 + 79 =
  30. 30.94 + 18 =
  31. 31.366 + 97 =
  32. 32.174 + 18 =
  33. 33.468 + 27 =
  34. 34.171 + 17 =
  35. 35.394 + 98 =
  36. 36.298 + 67 =
  37. 37.245 + 99 =
  38. 38.129 + 69 =
  39. 39.303 + 99 =
  40. 40.281 + 88 =

Answer key

  1. 551
  2. 489
  3. 137
  4. 191
  5. 129
  6. 269
  7. 350
  8. 552
  9. 363
  10. 477
  11. 464
  12. 508
  13. 278
  14. 137
  15. 257
  16. 152
  17. 203
  18. 122
  19. 180
  20. 491
  21. 518
  22. 564
  23. 148
  24. 559
  25. 144
  26. 122
  27. 186
  28. 508
  29. 383
  30. 112
  31. 463
  32. 192
  33. 495
  34. 188
  35. 492
  36. 365
  37. 344
  38. 198
  39. 402
  40. 369

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