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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 362 · 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. 1.131 + 97 =
  2. 2.192 + 67 =
  3. 3.102 + 67 =
  4. 4.168 + 37 =
  5. 5.289 + 48 =
  6. 6.320 + 69 =
  7. 7.214 + 39 =
  8. 8.440 + 68 =
  9. 9.68 + 69 =
  10. 10.135 + 88 =
  11. 11.302 + 79 =
  12. 12.429 + 49 =
  13. 13.66 + 78 =
  14. 14.49 + 77 =
  15. 15.419 + 48 =
  16. 16.161 + 19 =
  17. 17.378 + 78 =
  18. 18.35 + 87 =
  19. 19.446 + 89 =
  20. 20.159 + 98 =
  21. 21.62 + 27 =
  22. 22.165 + 88 =
  23. 23.448 + 98 =
  24. 24.273 + 97 =
  25. 25.381 + 68 =
  26. 26.69 + 18 =
  27. 27.83 + 37 =
  28. 28.407 + 58 =
  29. 29.466 + 97 =
  30. 30.42 + 79 =
  31. 31.231 + 78 =
  32. 32.474 + 97 =
  33. 33.198 + 79 =
  34. 34.172 + 98 =
  35. 35.373 + 79 =
  36. 36.43 + 27 =
  37. 37.285 + 67 =
  38. 38.463 + 89 =
  39. 39.395 + 68 =
  40. 40.94 + 19 =

Answer key

  1. 228
  2. 259
  3. 169
  4. 205
  5. 337
  6. 389
  7. 253
  8. 508
  9. 137
  10. 223
  11. 381
  12. 478
  13. 144
  14. 126
  15. 467
  16. 180
  17. 456
  18. 122
  19. 535
  20. 257
  21. 89
  22. 253
  23. 546
  24. 370
  25. 449
  26. 87
  27. 120
  28. 465
  29. 563
  30. 121
  31. 309
  32. 571
  33. 277
  34. 270
  35. 452
  36. 70
  37. 352
  38. 552
  39. 463
  40. 113

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