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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 86 · 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. 1.142 + 27 =
  2. 2.285 + 78 =
  3. 3.334 + 97 =
  4. 4.191 + 28 =
  5. 5.392 + 37 =
  6. 6.309 + 57 =
  7. 7.35 + 49 =
  8. 8.339 + 97 =
  9. 9.360 + 67 =
  10. 10.387 + 97 =
  11. 11.249 + 18 =
  12. 12.462 + 18 =
  13. 13.412 + 47 =
  14. 14.97 + 59 =
  15. 15.147 + 47 =
  16. 16.385 + 19 =
  17. 17.162 + 67 =
  18. 18.144 + 18 =
  19. 19.339 + 37 =
  20. 20.489 + 98 =
  21. 21.352 + 59 =
  22. 22.494 + 49 =
  23. 23.353 + 67 =
  24. 24.471 + 19 =
  25. 25.188 + 17 =
  26. 26.282 + 98 =
  27. 27.63 + 49 =
  28. 28.104 + 27 =
  29. 29.95 + 19 =
  30. 30.170 + 67 =
  31. 31.362 + 17 =
  32. 32.112 + 69 =
  33. 33.195 + 89 =
  34. 34.430 + 28 =
  35. 35.427 + 19 =
  36. 36.414 + 18 =
  37. 37.95 + 87 =
  38. 38.309 + 37 =
  39. 39.221 + 78 =
  40. 40.247 + 29 =

Answer key

  1. 169
  2. 363
  3. 431
  4. 219
  5. 429
  6. 366
  7. 84
  8. 436
  9. 427
  10. 484
  11. 267
  12. 480
  13. 459
  14. 156
  15. 194
  16. 404
  17. 229
  18. 162
  19. 376
  20. 587
  21. 411
  22. 543
  23. 420
  24. 490
  25. 205
  26. 380
  27. 112
  28. 131
  29. 114
  30. 237
  31. 379
  32. 181
  33. 284
  34. 458
  35. 446
  36. 432
  37. 182
  38. 346
  39. 299
  40. 276

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